Question

answer this question

Answer 1

/_PAT=/_TAN=/_PTA=/_ATN(half of 90° formed by tangents) =45°

Same with /_TBQ=/_OTB=/_NTB=/_NBT

/_NAT+/_NBT+/_ATN+/_BTN=180°[A.S.P]

45°+45°+/_ATB=180°

/_ATB=180°-90°

/_ATB=90°

Hope this helps u