The perimeter of a semicircle is 60 cm
Calculate its area

Step-by-step explanation:

Perimeter of the semi-circle:

Area of the semi-circle:

Circumference = 2πr

Circumference of a semicircle = πr

We need to find r. Given that the perimeter is 60 cm:

60 = π r

60 = 3.14r

60 ÷ 3.14 = r

19.11 = r

Area = πr²

Area = (3.14)(19.11)²

Area = (3.14)(365.19)

Area ≈ 1146.7 cm²

Divide by two since it's a semicircle:

1146.7 ÷ 2 = 573.35 cm²

Area of the semicircle measures about 573.35 cm²

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.

m=-16

step-by-step explanation: