Question

The name of a circle is the center. So P is the name of the circle and Point P is the actual center. We have, "circle P",

Answer 1

see explanation

Explanation:

(1)

The arc length is equal to the central angle, thus

arc AB = 81°

(2)

The circumference (C) of a circle is calculated as

C = 2πr ( r is the radius and r = 9 )

= 2π × 9 = 18π ≈ 56.5 cm ( to 1 dec. place )

(3)

Since BC is the diameter then arc CB = 180°, thus

The complete circle = 360°, thus

arc BD = 360° - (180 + 65 )° = 360° - 245° = 115°