Question

an architect built a scale model of a shopping mall. On the model a circular fountain 20 inches tall and 22.5 inches in diameter. If the actual fountain is to be 8 feet tall what is it diameter

Answer 1

3.) calculate diameter/height = 20/22.5 = 0.889
now multiply 8 feet by 0.889 = 7.11 feet diameter

Answer 2

The diameter is the length of the line through the center that touches two points on the edge of the circle. A diameter is really just made up of two radii.

Therefore, the diameter d of a circle is twice the radius r:

Formula : diameter/height = 20/22.5 = 0.889

0.889 * 8 = 7.11 feet diameter