Plane Geometry

AABC acute angle adjacent angles adjacent figure altitude Analysis angle equal angles are equal base angles bisects central angle chord circle of radius circumscribed congruent triangles Construct a circle Construct an angle Corollary corresponding sides diagonals diameter divided Draw equal angles equal circles equiangular equilateral triangle EXERCISES exterior angle Find the area Find the length Find the locus Find the number geometry given angle given circle given line given point Hence hexagon hypotenuse inscribed angle intersect isosceles trapezoid isosceles triangle legs median meet number of degrees obtuse opposite sides parallel lines parallelogram perimeter perpendicular bisector produced Proof Prove quadrilateral radii ratio rectangle regular polygon rhombus right angle right triangle secant similar polygons similar triangles straight angle straight line Theorem trapezoid triangle ABC triangle are equal triangle whose sides triangles are congruent unequal vertex angle vertices