Question

ABCD is a Trapezium Such that BC || AD and AB=4 cm ​

Answer 1

Step-by-step explanation:

Given BC∥AD and AD=4

Let BC=m

Let ∠AOD=x⇒∠COD=x

Let ∠OAD=y⇒∠OCB=y

Let CO=2a⇒OA=a

⇒△OAD and △OCB are similar.

⇒ADOA=CBOC

⇒4a=m2a

⇒m=8

Hence,BC=m=8