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

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step-by-step explanation:

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the sum of all the angles in a triangle are equal to 180

so you can add   the 3 given angles together to equal 180:

5y + 2y + 2y = 180

or since all three angles have the same letter, combine the 3 angles to equal 180:

9y = 180