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# What is Inner diameter of 20 ft container?

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## Related Questions

###### Asked in Math and Arithmetic, Algebra, Geometry

### What would the perimeter of a 20ft semicircle be?

That depends on what you mean by a "20 ft semicircle".
A semi-circle is a half circle.
A 20 ft circle could be:
A circle of diameter 20 ft
The perimeter of the semicircle is half the circumference plus the
diameter
→ perimeter = 1/2π 20 ft + 20 ft
= 10π + 20 ft
≈ 51.42 ft
A circle of radius 20 ft
The perimeter of the semicircle is half the circumference plus
double the radius
→ perimeter = 1/2 2π 20 ft + 2 x 20 ft
= 20π + 40 ft
≈ 102.08 ft
A circle of circumference 20 ft
The perimeter of the semicircle is half the circumference plus the
diameter
→ perimeter = 1/2 20 ft + 20 ft ÷ π
= 10 ft + 20/π ft
≈ 16.37 ft
However, if a 20 ft circle is a circle with a circumference (=
perimeter) of 20 ft then a 20 ft semi-circle could be a semicircle
with a perimeter of 20 ft
→ perimeter = 20 ft

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