The perimeter of a semicircle consists of two parts. (the curve and bottom) That curve is half the distance around the circle, since it's been split in half. The distance around a circle, the circumfrence, is equal to 2πr, where r is the radius of that circle. In this case, the circumfrence of the entire circle would be 16π. and so that curve would have a length of just 8π. Using 3.14 for π, 8π = 8×3.14 = 25.12. As for the flat part, that is the diameter (distance across) our circle. The radius is the distance from the center of a circle to its edge, and always has half the length of the diameter. (you can break the diameter down into two radii) If our radius is 8 meters, our diameter (the flat part of that semicircle) must be 16. Now we add up the two parts of the perimeter...25.12 + 16 = 41.12.
I think you would do 39 x 4 because if the SQUARE brick has sides 1 foot long, you count up the sides and get 4 feet. She has 29 square feet of patio bricks so you would multiply 39 x 4. I don't know if this is correct. Hopefully I helped!
