Question

an umbrella has ribs equally spaced. find the area between two consecutive ribs if umbrella is considered to be a circle of radius 21cm​

Answer 1

Answer:

346.5

Step-by-step explanation:

r = 21cm

Area of circle =

$\pi {r}^{2}$

A = (22/7)x21x21 = 1386 sq.cm

let say the umbrella have 8 ribs

so 1386 = 360"

for 2 ribs' space: (2/8)x360 = 90

for 90" we get 1386x90/360 = 346.5