Answer:
10°
Step-by-step explanation:
180-20 = 160
<BCA = 160°
AC=CB because its Radius
so the angle for <CBA and <BAD also the same
(180 - 160) ÷ 2 = <BAD
<BAD = 10°
∠ BAD = 10°
The inscribed angle BAD is half the measure of the central angle BCD, then
∠ BAD = [tex]\frac{1}{2}[/tex] × 20° = 10°
