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/_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
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