Question

Please I need fully solved​

Answer 1

Answer:

construction: Draw a line LM ( from left to right ) parallel to PQ and RS and which passes through A .

Now,

LM|| PQ

angle QBA = angle BAL ( alt. interior angle ) ... (1)

Again,

LM || RS

angle ACS = angle CAL ( alt. interior angle ) ... (2)

adding 1 and 2

angle QBA + angle ACS = angle BAL + angle CAL

angle QBA + angle ACS = angle BAC

This is your answer. I hope it's helpful to you.