+10 What are the answers i don't understand! find the circumference of a circle if its radius is 9mm? find the circumference of a circle if its radius is 10in? find the circumference of a circle if its diameter is 3 in. find the circumference of a circle if its diameter is 56mm. the diameter of a pizza is 16in. what is the area? find the circumference of a semi-circle if the diameter is 40cm. A dog is leashed to a corner of a house. How much running area does it have if from the corner out is 20ft?
+2592 2pi*r is the formula for circumference
I believe pi*r^2 is area
9*2*pi = 56.55 mm
10*2*pi = 62.83 inches
3*2*pi = 18.85 inches
28*2*pi = 175.93 mm
pi*8^2 = 201.06 inches^2
(pi*2*20)/2 = 62.83 cm
So this last one requires some thinking
A corner is 90 degrees
And the leash can be used as the raduis of a circle.
So we just have to find 3/4 of the area of this circle
(3(pi*20^2))/4 = 942.48 ft^2
+2592 2pi*r is the formula for circumference
I believe pi*r^2 is area
9*2*pi = 56.55 mm
10*2*pi = 62.83 inches
3*2*pi = 18.85 inches
28*2*pi = 175.93 mm
pi*8^2 = 201.06 inches^2
(pi*2*20)/2 = 62.83 cm
So this last one requires some thinking
A corner is 90 degrees
And the leash can be used as the raduis of a circle.
So we just have to find 3/4 of the area of this circle
(3(pi*20^2))/4 = 942.48 ft^2
