Question

please solve number 5,6,7 with process

Answer 1

5.
(i)
circumference = 2πr
88 = 2πr
R = 44/π = 44x7/22 = 14

★Area = πr² = 22x14x14/7 = 616m²

(ii)
area = πr²
15400 = 22xr²/7
r² = 15400x7/22 = 700x7 = 4900
r = 70m

Circumference = 2πr
circumference = 2x22x70/7
★circumference = 440m

6.
Area of quadrant = πr²/4
area = 22x7x7/7
★area = 154cm²

7.
(i)
total area =area of rectangle+area of semicircle
area = (3x4)+πr²/2
area = 12 + 3.14x2x2
area = 12+12.56
★area = 24.56cm²

(ii)
total area=area of rectangle+area of smaller semicircle+area of bigger semicircle

total area = (3x4)+π(1)²/2+π(2)²/2
total area = 12+1.57+6.28
★total area = 19.85cm²