Answer:
Explanation:
Problem Green
Look at the white area. Where it meets the green border is the region of a quarter circle. So the quarter circle has a circumference of 1/4 * (2pi) r
r we are to take it, is 10/2 = 5 cm. It is 1/2 the side of the square..
So the perimeter of 1/4 green circle is (2/4) pi * 5 = 1/2 pi * 5 = 2.5*pi
There are 4 such areas.
So we have to multiply by 4
4 * 2.5 = 10 pi
The answer is 10*pi.
An alternate answer is 31.4 cm
Problem Two
Large Circle
Perimeter of the large circle = 2pi*r
r = 14 cm
Perimeter of the large circle= 2* pi * 14 = 28*pi
Small Circle
r = 14/2 = 7 cm
Perimeter = 2*pi*r
Perimeter = 2 * pi * 7
Perimeter = 14 pi
Answer
Total Perimeter = Small Circle + Big Circle
Total Perimeter = 14*pi + 28*pi = 42*pi
Your answer could be 42*3.14 = 131.88
If none of these are right, list your choices.