The radius of circle c is 6 units and the measure of central angle abc is pi/2 radians.

1). 113 unit²

2). 28 unit²

3). 22 unit²

Step-by-step explanation:

Given in the question Radius of the circle = 6 units and measurement of angle ACB = π/2

1). Area of the given circle = πr² = 3.14×(6)² = 3.14×36 = 113 unit²

2). Area of the sector created by ACB = 1/4×(area of the circle) = 1/4×113 = 28 unit²

3). Area of the shaded region of the circle = area of the sector created by ACB - area of the ΔDCE

= 28 - 1/2×3√(25-9)= 28 - 1/2×3×4 = 28 - 6 = 22 unit²

3/6   and 9/18

step-by-step explanation:

a

b

d

step-by-step explanation: