Question

abcd is rectangle and bd is one of its diagonal ar(abd)=8cm find ar(bcd)

Answer 1

A diagonal of a rectangle divides it into two congruent triangles
⇒ ΔABD congruent to ΔBCD
We know that areas of two congruent triangles are equal
⇒ ar(ΔABD) = ar(ΔBCD)
⇒ 8cm² = ar(ΔBCD
∴ ar(ΔBCD) = 8cm²