how can i find the perimeter of a semi circular flower bed of diameter 20m?

The perimeter of a circle is PI*diameter.

Half that is PI*diameter/2

Now add the straigh edge, diameter.

Viola, you have it.

what do u mean add the straight edge im still a bit confused

The formula for circumference (perimeter) of a circle is

C = pi * diameter

C = 3.14 * 20
C = 62.8 m

For a semicircle's perimeter, divide the circumference in half and add 20.

A semicircle has a straight edge.

http://mathworld.wolfram.com/Semicircle.html

i get it now

To find the perimeter of a semi-circular flower bed, you need to find the circumference of the semi-circle. Here's how you can do it:

1. Recall that the formula for the circumference of a full circle is given by: C = πd, where C is the circumference and d is the diameter.
2. Since we only have a semi-circle, we need to find half of the circumference. So, divide the diameter (20m) by 2 to get the radius of the semi-circle: r = d/2 = 20m/2 = 10m.
3. The formula for the circumference of a semi-circle is given by: C = (πd)/2, where C is the circumference and d is the diameter. However, we already have the radius (10m), so we can rewrite the formula as: C = πr.
4. Substitute the value of the radius (10m) into the formula: C = π * 10m.
5. Calculate the circumference by multiplying π (approximately 3.14) with the radius (10m): C ≈ 3.14 * 10m.
6. Multiply the approximate value of π with the radius (10m): C ≈ 31.4m.
7. Therefore, the perimeter of the semi-circular flower bed is approximately 31.4 meters.