Question

An umbrella has 12 evenly spaced ribs. If viewed as a flat circle of radius 11 units,

then what would be the area between two consecutive ribs of the umbrella

Answer 1

Area = 121pi/12

~= 31.66 sq units

Explanation:

They are talking about looking at an umbrella like its a circle. The radius is 11 units. That is from the center to the edge.

Consecutive means "in a row" or "next to each other" The 12 "ribs" are the like skeleton structure in the umbrella. But they cut the umbrella into 12 areas. They are asking for the area of one "slice". It is 1/12 of the area of the whole circle.

Area of a circle is

A = pi × r^2

Area of one slice is 1/12 of the whole.

A(1 slice)

= 1/12× pi × r^2

See image.