Question
A sector is cut-off from a circle of radius 21 cm. The angle of the sector is . Find the length of its arc and the area.
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Question 1
The inside perimeter of a running track (shown in figure) is 400m. The length of each of the straight portion is 90m and the ends are semi-circles. If the track is everywhere 14m wide, find the area of the track. Also find the length of the outer running track.Question 2
An umbrella has ribs which are equally spaced. Assuming umbrella to be a flat circle of radius cm, find the area between the two consecutive ribs of the umbrella.Question Text | A sector is cut-off from a circle of radius 21 cm. The angle of the sector is
. Find the length of its arc and the area. |