## Plane Geometry |

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### Common terms and phrases

altitude base bisector bisects C0R0LLARY chord circle of radius circles intersect circumcenter circumcircle circumference concyclic construct Corollary cyclic quadrilateral Definition diameter drawn parallel equidistant equilateral triangle example extended exterior angle externally tangent figure Find the angle Find the area Find the length Find the radius fixed point geometry given circle hence hypotenuse inscribed inscribed angle isosceles triangle joining the midpoints K-ABC line is drawn line parallel line-segment medians meets BC midpoint of side opposite sides orthocenter pair parallel lines parallel to CD parallelogram ABCD perimeter perpendicular perpendicular-bisector point on side produced meet Prove THE0REM Prove triangle Pythagorean Theorem quadrilateral ABCD radii ratio rectangle regular polygon respectively rhombus right angle right triangle secant Show side BC similar triangles square straight line Suggestion Theorem third side trapezoid triangle ABC triangle XYZ vertex vertices