Geometry Practice Test 1

PA and PB is the diameter’s of the two circles.
Join P and Q.
∠PQA = 90° {∵ Angle in semi circle}
∠PQB = 90° {∵ Angle in semi circle}

⇒ ∠PQA +∠PQB = ∠AQB
∠AQB = 180°