Problema Solution
The ratio of the radii of two circles is 9:16. What is the ratio of their circumferences
Answer provided by our tutors
Let
R1 = 9x
R2 = 16x
are the radii of the circles.
The circumference of the circle with radii R1 is 2R1pi = 2*9x*pi = 18xpi.
The circumference of the circle with radii R2 is 2R2pi = 2*16x*pi = 32xpi.
The ratio of the circumferences is:
18xpi : 32xpi = 18 : 32 = 9 : 16.