Question

2.2 Solve the following questions:
(a) Construct triangle ABC, where AB = 6.2cm, BC 4.5cm and LB-70
First draw a rough diagram.
(b) Find the radius and area of a circle with circumference 132mm.​

Answer 1

Step-by-step explanation:

Circumference of circle = 132 cm

2πr = 132

2 x 22/7 x r = 132

r = (132 x 7)/(2 x 22)

r = 21cm

∴ Area of circle = πr2

= 22/7 x 21 x 21

= 1386 cm2

(ii) Circumference of circle = 22 m

∴ 2πr = 22

2 x 22/7 x r = 22

r = (22 x 7)/(2 x 22)

r = 7/2

r = 3.5 m

Area of circle = πr2

= 22/7 x 3.5 x 3.5

= 38.5 m2