2 Answers

Evan Shaw · Answer 1 · 2021-01-28T04:02:47+0000

Answer:

16.9 m

Explanation:

Start with a half a circle. The central angle of a semicircle is 180 deg.

Now subtract 21 deg on each side.

180 - 21 - 21 = 138

The central angle is 138 deg.

The radius is 7 m.

Now we use the formula for the length of an arc of a circle given the radius of the circle and the central angle of the arc.

$s = (n)/(360^\circ)2 \pi r$

$s = (138^\circ)/(360^\circ)2(3.14159)(7~m)$

s = 16.9~m

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