Geometry Problem 1301.
Arbelos, Semicircles, Diameters, Circle, Incircle, Incenter, Square, Midpoint, Concurrency.
Geometry Problem 1302.
Triangle, Median, Midpoint, Circles, Diameters, Congruence.
Geometry Problem 1303.
Triangle, 60 Degrees, Angle Bisector, Measurement.
Geometry Problem 1304.
Triangle, 120 Degrees, Angle Bisector, Measurement.
Geometry Problem 1305.
Triangle, Circumcircle, Angle Bisector, Arc, Perpendicular, Area.
Geometry Problem 1306.
Cyclic, Inscribed Quadrilateral, Circle, Tangent, Diagonals, Collinear Points.
Geometry Problem 1307.
Triangle, Incenter, Parallel line, Sides, Measurement.
Geometry Problem 1308.
Quadrilateral, Diagonal, Triangle, Incircle, Tangent Line, Sides, Measurement.
Geometry Problem 1309.
Triangle, Circle, Inradius, Excircle, Tangent, Exradius, Measurement.
Geometry Problem 1310.
Square, Center, Right Triangle, Area, Measurement.
Geometry Problem 1311.
Inscribed Triangle, Circle, Circumcircle, Concyclic Points, Measurement.
Geometry Problem 1312.
Triangle, 60 Degrees, Circle, Circumcenter, Orthocenter, Altitude, Distance, Perpendicular, Measurement.
Geometry Problem 1313.
Regular Decagon, Pentadecagon, Equilateral Triangle, Congruence.
Geometry Problem 1314.
Equilateral Triangle, Incircle, Inscribed Circle, Tangent, Congruence.
Geometry Problem 1330.
Two Squares Side by Side, Parallel, 45, 90 Degrees.
Geometry Problem 1331.
Two Squares Side by Side, Parallel, Perpendicular, 90 Degrees, Measurement.
Geometry Problem 1332.
Two Squares Side by Side, Triangle, Area.
Geometry Problem 1315.
Triangle, Incircle, Tangent, Chord, Circle, Congruence.
Geometry Problem 1316.
Triangle, Incircle, Tangent, Chord, Midpoint, Sum of two Segments, Congruence.
Geometry Problem 1317.
Triangle, Excircle, Chord, Tangent, Midpoint, Arc, Sum of two Segments, Congruence.
Geometry Problem 1318.
Rectangle, Equilateral Triangle, Distances, Perpendicular, Measurement.
Geometry Problem 1319.
Hexagons, Equilateral Triangles, Center, Midpoints.
Geometry Problem 1320.
Triangle, Incircle, Tangent, Chord, Circle, Parallel, Perpendicular, Collinearity.
Geometry Problem 1321.
Intersecting Circles, Diameter, Secant, Chord, Collinearity.
Geometry Problem 1322.
Triangle, Angle Bisector, Circumcircle, Chord, Secant, Sum of two Angles.
Geometry Problem 1323.
Square, Angle Trisector, Diagonal, Regular Dodecagon, Area, 3060 degrees.
Geometry Problem 1324.
Quadrilateral, Diagonal, 45 Degrees, Angle Bisector, Isosceles Triangle, Congruence.

Geometry Problem 1325.
Octagons, Midpoints, Squares, Mobile Apps, iPad.
Geometry Problem 1326.
Triangle, Cevian, Incenters, Sum of Angles, 270 Degrees.
Geometry Problem 1327.
Two Squares Side by Side, Perpendicular, 90 Degrees, Angle.
Geometry Problem 1328.
Two Squares Side by Side, Perpendicular, 90 Degrees, Congruence.
Geometry Problem 1329.
Two Squares Side by Side, Parallel, Perpendicular, 90 Degrees, Congruence.
Geometry Problem 1333.
Two Squares Side by Side, Three Triangles, Area, Measurement.
Problem 1334. Square, Kite, Sum of Segments.
Problem 1335. The
Lune of Hippocrates has the same area of a Kite.
Problem 1336. Right Triangle, Cevian, Double Angle, Perpendicular, 90 Degrees.
Problem 1337.
Parallelogram, Diagonals, Circle, Circumcircle, Tangent Line, Triangle, Congruence.
Problem 1338.
Four Squares, Diagonals, Angle, 45 Degrees, Areas.
Problem 1339.
Circle, Diameter, Tangent, Secant, Parallelogram.
Problem 1340.
Triangle, Incenter, Concentric Circles, Isosceles Triangles, Congruence.
Problem 1341.
Isosceles Triangle, 802080 Degrees, Circumcenter, Angle Bisector.
Problem 1342.
Circle, Secant, Chord, Midpoint, Concyclic Points, Cyclic Quadrilateral.
Problem 1343.
Triangle, Excircles, Circle, Tangent, Tangency Points, Chord, Perpendicular, 90 Degrees, Collinearity.
Geometry Problem 1344, Bottema's Theorem: Triangle and Squares with Interactive
Geometry Software.
Geometry Problem 1345. Three Equilateral Triangles, Center, Area, Common Vertex.
Geometry Problem 1346. Equilateral Triangle, Point on the Incircle, Altitude, Perpendicular, Sum of Squares, Distance.
Geometry Problem 1347. Triangle, Angle Bisector, Congruence, Circumcircle, Tangent, Equilateral Triangle.
Geometry Problem 1348. Three Concentric Circles, Equilateral Triangle, Perpendicular Bisector, Congruence.
Geometry Problem 1349. Three Squares, 90 Degrees, Perpendicular Lines, Diagonal. Math Infographic.
Geometry Problem 1350. Triangle with three Intersecting Circles, Incircle, Collinear Points.
Geometry Problem 1351. Two Tangential or Circumscribed Quadrilaterals, Midpoints, Perpendiculars.
Geometry Problem 1352. Rectangles, Sum of Squared Distances.

Geometry Problem 1353. Tangent Circles, Perpendicular Diameters, Congruence, 30 Degrees.
Geometry Problem 1354. Circle, Tangent Lines, Secant, Chord, Center, Parallel Lines.
Geometry Problem 1355.
Triangle, Midpoint, Median, Circle, Chord, Equal Product of measure of segments.
Geometry Problem 1356.
Quadrilateral, Triangle, Angle, 30 Degrees, Congruence.
Geometry Problem 1357.
Regular Dodecagon, Diagonals, Concurrency, Collinearity, Points, Lines.
Geometry Problem 1358.
Regular Dodecagon, Diagonals, Concurrency, Points, Lines.
Geometry Problem 1359.
Triangle, Circumcircle, Congruent Angles, Midpoints.
Geometry Problem 1360.
Triangle, NinePoint Circle, Feuerbach's Circle, Euler's Circle, Cyclic Quadrilateral, Concyclic Points, Sketch, iPad Apps.
Geometry Problem 1361.
Triangle, Two NinePoint Circles, Feuerbach's Circle, Euler's Circle, Congruent Angles, Sketch, iPad Apps.
Geometry Problem 1362.
Equilateral Triangle Inscribed in a Circle, Lunula, Ratio of Areas, Tangent, Sketch, iPad Apps.
Geometry Problem 1363.
Square, Angle Bisector, Perpendicular, 45 Degrees, Angle, Sketch, iPad Apps.
Geometry Problem 1364.
Square, Inscribed Circle, Area, Angle Bisector, Perpendicular, 45 Degrees, Sketch, iPad Apps.
Geometry Problem 1365.
Circle, Tangent, Secant, Chord, Parallel, Midpoint, Sketch, iPad Apps.
Geometry Problem 1366.
Square, Angle Bisector, Perpendicular, Concyclic Points, Circle, Sketch, iPad Apps.
Geometry Problem 1367: Equilic
Quadrilateral 1.
Geometry Problem 1368: Equilic
Quadrilateral 2.
Geometry Problem 1369: Equilic
Quadrilateral 3.
Geometry Problem 1370: Equilic
Quadrilateral 4.
Geometry Problem 1371: Equilic
Quadrilateral 5.
Geometry Problem 1372. Equilateral Triangle, Exterior Cevian, Inradius, Exradius, Altitude, Sketch, iPad Apps.
Geometry Problem 1373. Isosceles Triangle, Exterior Cevian, Inradius, Exradius, Altitude to the Base.
Geometry Problem 1374. Isosceles Triangle, Exterior Cevian, Incircle, Excircle, Tangency Points, Parallel Lines.
Geometry Problem 1375. Isosceles Triangle, Interior Cevian, Exradius, Excircle, Altitude to the Base.
Geometry Problem 1376. Isosceles Triangle, Interior Cevian, Excircles, Tangency Points, Parallel Lines.
Geometry Problem 1377. Isosceles Triangle, Interior Cevian, Equal Sum of Exradii, Excircle.

Geometry Problem 1378. Parallelogram, Diagonal perpendicular to a side, Distances from a Point to Vertices, Measurement.
Geometry Problem 1379. Common External Tangents. Circles, Secant, Congruent Chords.
Geometry Problem 1380. Common
Internal Tangents. Circles, Secant, Congruent Chords.
Geometry Problem 1381. Parallelogram, Exterior Point, Triangle, Area.
Geometry Problem 1382. Circle, Diameter, Radius, Perpendicular, Congruence.
Geometry Problem 1383. Triangle, Median, Circle, Chord, Secant, Sum, Product.
Geometry Problem 1384. Triangle, Orthocenter, Circle, Circumcircle, Angle Bisector, 90 Degree.
Geometry Problem 1385. Triangle, Orthocenter, Circle, Circumcircle, Angle Bisector, Midpoint, Collinear Points.
Geometry Problem 1386. Thabit ibn Qurra (826 901) Theorem and more conclusions, generalized Pythagorean Theorem to any triangle.
Geometry Problem 1387. Quadrilateral, Double Angle, Congruence, Isosceles Triangle.
Geometry Problem 1388. Triangle 406080 degree, Incenter, Congruence.
Geometry Problem 1389. Triangle, 4012020 degree, Angle, Congruence.
Geometry Problem 1390. Triangle, any point, perpendicular, sum of the squares.
Geometry Problem 1391. Two Triangles, Ratio of Areas, Circumcircle.
Geometry Problem 1392. Two Cyclic Quadrilateral, Cyclic Octagon, Circle.
Geometry Problem 1393. Monge's Circle Theorem, Three Circles and Three Pair of Common Tangents, Collinearity.
Geometry Problem 1394. Three Circles and Three Pair of Common Internal Tangents, Concurrency. 