PLEASE SOMEONE EXPLAIN WHAT I DO!!! I DONT UNDERSTAND!

it says

find the indicated measure in ABCD. Explain your reasoning.

i am doing a quiz today and this is review work. i seriously need someone to explain this to me asap. please help

PLEASE SOMEONE EXPLAIN WHAT I DO I DONT UNDERSTANDit says find the indicated measure in ABCD Explain your reasoning i am doing a quiz today and this is review w class=

Respuesta :

Answer:

b

Step-by-step explanation: