Question
Paint Roller A has a length of 12 in. and a diameter of 2 in. Paint Roller B has a length of 8 in. and a diameter of 3 in. Which roller can spread more paint on a wall in one revolution
Answers
Ms. Sue
Use the formula:
A = 2 * pi * r * h
A = 2 * pi * r * h
Hannah
a= 2 x 3.14x 1 x 12
a = 75.36
a = 2 x 3.14x 8 x 3
a= 150.71
roller B
a = 75.36
a = 2 x 3.14x 8 x 3
a= 150.71
roller B
Ms. Sue
In b, you used the diameter, not the radius.
2 * 3.14 * 1.5 * 8 = 75.36
They both cover the same amount of wall in one revolution.
2 * 3.14 * 1.5 * 8 = 75.36
They both cover the same amount of wall in one revolution.