CIRCLES - radius, diameter, circumference, area

The circumference of the clock in Jason's room is 43.96 in.

^{What would you do to determine the diameter of the clock?}

The picture shows 3 equal circles touching each other.

QV = 7.3 cm. Calculate the perimeter of the triangle QUS.

It measurement, in cm, will be:

The image shows 4 equal coins in a row. The radius of one of these coins is 6.25 cm as shown. Calculate the distance, in mm, from the point R to the point S.

A cathedral window is built in the shape of a semicircle. If the window is to contain three stained glass sections of equal size, what is the area of each stained glass section? Express answer to the nearest square foot. (Hint: the 3 sections together are 1/2 a circle, so each section is how much of the circle?)

The diameter of circle L is 20 units and the diameter of circle M is 13 units and QR = 4. Find LQ.