Question

Please answer this correctly

Answer 1

879.20 km²

Explanation:

Shaded area= Area of whole circle- area of white circle

Area of circle= πr²

Radius of whole circle= 10+18/2= 19 km

Area of whole circle= 3.14*(19 km)²= 1133.54 km²

Are of white circle= 3.14*(9 km)²= 254.34 km²

Shaded area= 1133.54 km²- 254.34 km²= 879.20 km²

Answer is 879.20 km²

Answer 2

Answer: 879.20 km²

Explanation:

The diameter of the big circle is 2(10) + 18 = 38

divide the diameter by 2 to get the radius (r) = 19

Area (A) = π·r²

= π(19)²

= 361π

The diameter of the small circle is 18

divide the diameter by 2 to get the radius (r) = 9

Area (A) = π·r²

= π(9)²

= 81π

The area of the shaded region is the difference between the big circle and the small circle.

`Area_(shaded)=A_(big)-A_(small)`

= 361π - 81π

= 280π

= 280(3.14)

= 879.20