Best Answer

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

→ perimeter = 1/2π 20 ft + 20 ft

= 10π + 20 ft

≈ 51.42 ft

- A circle of radius 20 ft

→ perimeter = 1/2 2π 20 ft + 2 x 20 ft

= 20π + 40 ft

≈ 102.08 ft

- A circle of circumference 20 ft

→ 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

Q: What would the perimeter of a 20ft semicircle be?

Write your answer...

Submit

Still have questions?

Continue Learning about Algebra

The answer will depend on what measure of the semicircle is 5 inches: its radius or diameter.

dot know ..... just tell me the answer stupid computer

8*pi + 16 = 41.13 cm (approx)It depends on whether 8 cm is the radius or diameter of the semicircle.

5ft x 4 = 20ft

Perimeter l+l+w+w= 70ft Area LxW =300 sqft

Related questions

Perimeter of a semicircle is the length of the half-circle plus the diameter. The whole circle would have a length of diameter times pi, but since it's only half... Perimeter of semicircle = (1/2*pi*D) + D

The circumference of a circle = 2π r = π a (where a is the base of the semicircle and is also the diameter of the circle) The perimeter of the semicircle = half the perimeter of the circle + the base length The perimeter of the semicircle = πa/2 + a = a(1 + π /2) feet

To find the perimeter of the curved section of the semi-circle: Perimeter of semicircle = Pi x radius If you also need to the find the perimeter of the straight part of the semicircle (the diameter), it is simply double the radius.

The perimeter of a semicircle with radius R is pi*R + 2*R = R*(pi + 2)

A semicircle is half a circle. So the perimeter of a semicircle is half the circumference of the whole circle plus the diameter, which is twice the radius: perimeter = 1/2 x 2{pi}r + 2r perimeter ~= 3.14x8 + 2x8 ~= 41.13cm

The answer will depend on what measure of the semicircle is 5 inches: its radius or diameter.

If the distance round the circle is 5.14 units then the distance round 1/2 of it would be 2.57 units.

20ft is the perimeter.

The area would be 32*pi miles squared. The perimeter would be 16*pi miles.

It is its diameter plus half of its circumference

Perimeter of the semicircle including its base: 180/360*pi*45+45 = 115.686 cm rounded to 3 decimal places

20ft