Question

From vertex A of regular pentagon ABCDE, two diagonals are drawn, forming three triangles. a. Prove that two of the triangles formed by the diagonals are congruent. b. Prove that the congruent triangles are isosceles. c. Prove that the third triangle is isosceles.From vertex A of regular pentagon ABCDE, two diagonals are drawn, forming three triangles. a. Prove that two of the triangles formed by the diagonals are congruent. b. Prove that the congruent triangles are isosceles. c. Prove that the third triangle is isosceles.