Question

Find the radius of a circle that has this measurement.

d = 2.25 cm

Answer 1

hint : r = d/2

Answer 2

This question is about definitions
see http://www.coolmath.com/reference/circles-geometry.html

Think of it as learning two new words to add to your vocabulary.

the diameter is the longest line through a circle. It goes through the circle's center.
the radius is 1/2 of the diameter

Answer 3

1.125 cm

Answer 4

yes, radius =1.125

Answer 5

This is not math, it is english... learning new words