Question

A circle that has a radius of 6 units has a circumference of 37.68 units. What is the circumference of a circle that has a radius of 24 units?

602.88 units
150.72 units
904.32 units
678.24 units

Answer 1

unit analysis
radius = 6 units, circumference = 37.68 units
circumference/radius is unitless; unitless values are constant
circumference/radius = 37.68units/6units = 37.68/6 = 6.28
radius = 24 units, circumference = ? units
circumference/radius = ?/24 = 6.28
find ?

Answer 2

602.88 @eashy

Answer 3

? = 6.28*24 = 150.72

Answer 4

oh I get it