Geometry Theorems and Problems - Recent Additions (Page 5 of 15) Butterfly theorem proof HTML5 Animation for iPad and Nexus. Geometry Problem 1143. Triangle, Circumcircle, Tangent Line, Reflection of a Point over a Line, Tangent Circles, Collinear Points. Geometry Problem 1142. Cyclic Quadrilateral, Isogonal Lines, Circle, Center, Radius, Perpendicular Bisector, Circumcenter. Geometry Problem 1141. Inscribed Pentagon, Circle, Triangle, Congruence, Midpoint, Concurrency. Geometry Problem 1140. Triangle, Circumcircle, Circle, Center, Collinear Points. Geometry Problem 1139. Triangle, Circumcircle, Angle Bisector, Parallel Lines, 90 Degrees, Concurrent Lines. Geometry Problem 1138. Square, Perpendicular, Angle, 90 Degrees, Triangle, Congruence. Geometry Problem 1137. Triangle, Circumcircle, Orthocenter, Midpoint, Arc, Collinear Points, Tangent Circles. Geometry Problem 1136. Triangle, Circumcircle, Orthocenter, Midpoint, Arc, 90 Degrees, Angle. Geometry Problem 1135. Intersecting Circles, Secant, Parallel Line, 90 Degrees, Similar Triangles. Geometry Problem 1134. Tangent Circles, Tangent Line, Circumcircle, Circumcenter. Geometry Problem 1133. Circle, Chord, Tangent, Circumcircle, Similarity, Equal Product. Geometry Problem 1132. Triangle, Excircle, Tangency Point, Parallel, Midpoint. Geometry Problem 1131. Triangle Area, Two Cevians, Equal Product of Areas. Geometry Problem 1130. Cyclic Quadrilateral, Diagonals, Angle Bisector, Congruent Angles. Geometry Problem 1129. Isosceles Triangle, Circumcenter, Incenter, Parallel Lines, Perpendicular Lines. Geometry Problem 1128. Right Triangles, Medians, Parallel, Angles, Congruence, Half the measure. Geometry Problem 1127. Triangle, Circumcircle, Tangent, Circle, Diameter, Midpoint, Perpendicular, 90 Degrees. Geometry Problem 1126. Equilateral Triangle, Circumcircle, Metric Relation, Harmonic Mean. Geometry Problem 1125. Triangle, Four Equilateral Triangles, Centroid, Midpoint. Geometry Problem 1124. Triangle, Median, Two Squares, Area. Geometry Problem 1123. Hexagon, Triangle, 90 Degrees, Perpendicular Lines, Vertices, Area. Geometry Problem 1122. Triangle, 90 Degree, Perpendicular Lines, Orthocenter, Altitude, Midpoint, Collinear Points. Geometry Problem 1120. Isosceles Right Triangle, 120 Degree, Angle, Equilateral, Metric Relations. Geometry Problem 1119. Quadrilateral, Similar Triangles, Midpoints, Equal Ratio, Angles. Geometry Problem 1118. Right Triangle, Angle Trisection, Concyclic Points, Cyclic Quadrilateral. Geometry Problem 1117. Right Triangle, Angle Trisection, 90 Degrees, Parallel Lines. Geometry Problem 1116. Right Triangle, Angle Trisection, 90 Degrees, Perpendicular Lines. Geometry Problem 1115. Right Triangle, Angle Trisection, Equilateral Triangle. Geometry Problem 1114. Right Triangle, Angle Trisection, Isosceles, Congruence. Geometry Problem 1113. Triangle, Perpendicular Bisector, 90 Degrees, Circle, Concyclic Points, Cyclic Quadrilateral.

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