Question

in triangle abc d a b is congruent to AC BC is equal to 10 cm and the perimeter of triangle is 40 m find the area of ABCD

Answer 1

its very simple congruent means ac = 10perimeter is sum of its all three sides so10+10 let the third anglex10+10+x=40
40-20=20 x=20 apply the area formula on it