If the radius of a right circular cylinder is increased by 10 percent while its height remains constant, what is the percentage increase in its volume?
Show answer & explanation
Correct answer: C
Explanation
Radius increased by 10%, height constant
Volume = r²
New radius = 1.1r
New volume = (1.1r)² = 1.21r²
Increase = 1.21 − 1 = 0.21 = 21%