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angle BPQ + angle PQD =180°
1/2 BPQ + 1/2 PQD = 90°
••• angle TPQ + angle PQT = 90°
angle TPQ + angle PQT + angle PTQ = 180° (angle sum property of a triangle)
90° + angle PTQ = 180°
angle PTQ= 90°
HENCE PROVED that angle PTQ =90°
1/2 BPQ + 1/2 PQD = 90°
••• angle TPQ + angle PQT = 90°
angle TPQ + angle PQT + angle PTQ = 180° (angle sum property of a triangle)
90° + angle PTQ = 180°
angle PTQ= 90°
HENCE PROVED that angle PTQ =90°
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