Question

10. An umbrella has 8 ribs which are equally spaced
. Assuming umbrella to be a flat circle of radius
45 cm, find the area between the two consecutive ribs of
the umbrella.
11. A car has two wipers which do not overlap. Each wiper has
a blade of length 25 cm sweeping through an angle 115° .
Find the total area cleaned at each sweep of the blades.
12. To warn ships for underwater rocks, a lighthouse spreads a
red coloured light over a sector of angle 80° to a distance of
16.5 km. Find the area of the sea over which the ships are
warned. (Use = 3.14)​

Answer 1

Step-by-step explanation

i hope this is helpful to