Question

PA and PB are tangents from P to a circle with centre C. if angle APB is 40 degree, then find angle ACB.

Answer 1

$40 + 90 + 90 + angle \: acb = 360 \\ 220 + angle \: acb = \: 360 \\ angle \: acb \: = 360 - 220 = 140$

Answer 2

Answer:

140

Step-by-step explanation:

40°+ angle 1 +angle 2 + angle ACB =360°

40°+90°+90° +angle ACB = 360°

220°+ angle ACB = 360°

ACB = 360° - 220°

= 140°