The circumference of a circle is 30 cm.(a)Calculate the radius of the

1.	The circumference of a circle is 30 cm.(a)Calculate the radius of the circle.(b)The length of the arc of the semi-circle is 15cm.Calculate the area of the semi-circle.
Answer» Circumference = 30 cm 2πr = 30 R = 30/2π r = 4.77 (approximately) Now, LENGTH of the ARC = 15 cm Area of semicircle = ½lr = ½× 15 × 4.77 = 35.775 cm².

The circumference of a circle is 30 cm.(a)Calculate the radius of the circle.(b)The length of the arc of the semi-circle is 15cm.Calculate the area of the semi-circle.

Answer»

Circumference = 30 cm

2πr = 30

R = 30/2π

r = 4.77 (approximately)

Now,

LENGTH of the ARC = 15 cm

Area of semicircle = ½lr = ½× 15 × 4.77 = 35.775 cm².

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The circumference of a circle is 30 cm.(a)Calculate the radius of the circle.(b)The length of the arc of the semi-circle is 15cm.Calculate the area of the semi-circle.

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