A circular photograph has diameter 18cm and is to be placed in a 20cm square frame. Determine the ratio of the area of the photograph to the area of the frame.
Please help, thank you.
Area of photo divided by the area of the frame. Be sure to use the same area unit in both areas.
Good luck!
+130511 If the diameter of the photo is 18, then the radius = 9
And the area of the circle is
A = pi * r^2 = pi * (9)^2 = 81* pi
And the area of the frame is just (20)^2 = 400
So, the ratio of the area of the photo to the area of the frame is just .... [ 81 * pi ] : 400
