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.