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first you need to find what the circumference would be if it was a circle, so measure how much it is from the middle of the straight line of the semi-circle to the top of the arc. Double this number (so 5cm would become 10cm) then type into a calculator π then the number ( so in this case π x 10.) Then halve the answer. :)
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To find arc length what do you need to multiply a circle's circumference by?
the fraction of the circle covered by the arc
What is the arc in a circle that is 90 degrees?
To find the arc length, you also need to know the radius (or diameter) of the arc. The arc length is then found by finding the circumference of the full circle (2xPIxradius) and then dividing by 4 to find just one quarter of the circle (90 degrees).
How do you find the arc length of a circle?
length=n/360*2*pi*radius
How find radius in a circle given angle and length of arc?
angle of arc/ angle of circle (360°) = length of the arc/ total circumference (2 pi* radius) so you just have to find r then so: angle of arc/ angle of circle (360°) *2pi = length of the arc/ radius radius= ength of the arc/ angle of arc/ angle of circle (360°) *2pi not that hard ;)
An arc that measures 180 is called a?
SEMI-CIRCLE
