Question

giving you 10 points
please answer this fast
step by step...​

Answer 1

Step-by-step explanation:

Angle of minor sector = 90°

Area of minor sector(shaded area) = ∅/360 × πr²

=> 90/360 × 22/7 × 21 × 21

=> 1/4 × 22 × 3 × 21

=> 1/2 × 11 × 3 × 21

=> 693/2

=> 346.5 cm²

Area of circle = πr²

=> 22/7 × 21 × 21

=> 22 × 3 × 21

=> 1386 cm²

Area of major sector (unshaded area) = Area of circle - Area of minor sector

=> 1386 - 346.5

=> 1039.5 cm²

Answer 2

Step-by-step explanation:

Given, radius r=21cm and π=

7

22

Then,

Area of the circle = πr

2

sq units

=

7

22

×21×21

=22×3×21

=1386cm

2