3 years ago

What is the Circumference of a circle if its radius in 15 inches? Please help always a procrastinator in math! Thanks!

1 answer:

7 0

Circumference Formula:
$C = 2\pi \times R$
R = Radius = 15 in

$C = 2\pi \times 15$
$C = 30\pi \: inches$

Or C = 94,2 inches

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Aleks04 [339]

The area of the entire sector of DEF = 60 / 360 * PI * radius^2
sector area = 1 / 6 * 3.14159265... * 20^2
sector area = 209.4395102393 

segment area = sector area - triangle DEF Area
triangle DEF Area = (1/2) * 20 * sine 60 * 20
triangle DEF Area = (1/2) * 0.86603 * 400
triangle DEF Area = (1/2) * 346.412 
triangle DEF Area = 173.206 

segment area = 209.4395102393 -173.206

segment area = 36.2335102393 
segment area = 36.23 m

Source:
http://www.1728.org/circsect.htm

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