Search
Close this search box.
Search
Close this search box.

circle area and perimeter problem 3

exercise: circle area and perimeter problem 3


A circle has a perimeter of 80.3 inches. 

a) Calculate the diameter of the circle.

b) Calculate the radius of the circle.

c) Calculate the area of the circle

 

answer: circle area and perimeter problem 3


a) answer diameter

P = d * π      (π = 3.1415..)

80.3 = d * π   / : π   

d = 25.56 inches

A: The diameter of the circle is 25.56 inches.

 

b) answer radius

r = d : 2

r = 25,56 : 2

r = 12.78 inches

A: The radius of the circle is 12.78 inches.

 

c) answer area

A = r² * π

A = 12.78² * π

A = 513.11 in²

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