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.