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circle area and perimeter problem 2

exercise: circle area and perimeter problem 2


A circle has a diameter of 16 cm. 

a) calculate the radius

b) calculate the the perimeter/circumference of the circle.

c) calculate the area of the circle

 

answer: circle area and perimeter problem 2


a) answer radius

r = d : 2

r = 16 : 2

r = 8 cm

A: The radius of the circle is 8 centimeter.

 

b) answer perimeter

P = d * π

P = 16 * π       (π = 3.1415..)

P = 50.27 cm

A: The perimeter of the circle is 50.27 cm.

 

c) answer area

A = r² * π

A = 8² * π

A = 201.06 cm²

A: The area of the circle is 201.06 square centimeters.