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# can you help me

0
69
2

1010??

Find the arc length of the semicircle.
Either enter an exact answer in terms of \piπpi or use 3.143.143, point, 14 for \piπpi and enter your answer as a decimal.

units

Apr 7, 2020

#1
+932
+1

You are missing some information. The arc length requires at least a number to start calculations. The diagrams lacks numbers, but the arc length in the diagram is the radius of the semicircle multiplied by pi.

Hope it helps!

Apr 7, 2020

#1
+932
+1

You are missing some information. The arc length requires at least a number to start calculations. The diagrams lacks numbers, but the arc length in the diagram is the radius of the semicircle multiplied by pi.

Hope it helps!

HELPMEEEEEEEEEEEEE Apr 7, 2020
#2
+50
+2

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