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# help me

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4 1010??

Find the arc length of the semicircle.
Either enter an exact answer in terms of \piπpi or use 3.14 point, 14 for and enter your answer as a decimal.

units

Apr 7, 2020

#1
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How to find the arc:

(Diameter*pi)/2

Apr 7, 2020
#2
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or you can do the radius*pi

Apr 7, 2020
#3
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I've already explained how to do this question when you asked it in exactly the same way earlier. If you still need help, you might want to see what's missing from the question.

Thanks!

Apr 7, 2020
#4
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To find the arc length you have to use the following formula:

2*pi*r*(arcmeasure)/360

Let me explain this formula a bit...

2*pi*r, is the circumference of the circle, and we are finding a sector of that.

The sector is the fraction (arcmeasure/360), which is how much it takes up of the circle.

In this case, the arcmeasure is 180, since it's a straight angle, so the following equation would be

2*pi*r*(180/360)

= 2*1/2*pi*r

= pi*r

The radius isn't given, so if it was the arc length of the semicircle would be pi times the radius.

Enjoy!! :) :)

Apr 7, 2020