
Geometry Problems 1381  1390




Geometry Problem 1381. Parallelogram, Exterior Point, Triangle, Area. 

Conformal Mapping or Transformation of
Geometry Problem
1381. 

Poster of Geometry Problem 1381. 

Geometry Problem 1382. Circle, Diameter, Radius, Perpendicular, Congruence. 

Conformal Mapping or Transformation of Problem
1382. 

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. 

Conformal Mapping or Transformation of Problem
1386. 

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. 

Poster of Geometry Problem 1389. 

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. 

Geometry Problem 1395. Triangle with three rectangles on the sides, Midpoints, Perpendicular lines, Concurrency. 

Geometry Problem 1396. Triangle with three rectangles on the sides, Vertices, Perpendicular lines, Concurrency. 

Geometry Problem 1397. Circle, Diameter, Tangent, Secant, 90 Degrees Angle,
Perpendicular, Collinear Points. 

Geometry Problem 1398.
Isosceles Triangle, Circle, Radius, Perpendicular, Measurement. 

Geometry Problem 1399.
Triangle, Circumcircle, Perpendiculars, Angles, Congruence, Cyclic Quadrilateral. 

Geometry Problem 1400. Triangle with three rectangles on the sides, Perpendicular Bisectors, Concurrency. 

Geometry Problem 1401. Right Triangle with three circles on the sides, Isosceles, Diameter, Center, Tangent, Congruence. 

Geometry Problem 1402. Triangle, Three Tangent Circles, Parallel Diameter, Collinear Points. 

Geometry Problem 1403. Quadrilateral, 90 Degree Angle, Perpendicular, Congruence. 

Geometry Problem 1404. Three Circles, Center, Intersecting Points, Collinearity, Congruence. 

Geometry Problem 1405. Four Congruent Circles, Congruent Chords. 

Geometry Problem 1406. Four Congruent Circles, Measurement, Metric Relations,
Sum of the Squares. 

Geometry Problem 1407. Right Triangle, Incircle, Excircle, Collinear Tangency Points, Collinearity. 

Geometry Problem 1408. Right Triangle, Incircle, Excircle, Incenter, Midpoint, Tangency Point, Collinearity. 

Typography of Geometry Problem 1408. Right Triangle, Incircle, Excircle, Incenter, Midpoint, Tangency Point, Collinearity, iPad Apps. 

Geometry Problem 1409. Right Triangle, Incircle, Excircle, Collinear Tangency Points, Collinearity. 


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 by Antonio Gutierrez
Last updated:
Dec 12, 2018
