It depends on the type of figure you are looking at.
For a:
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Area = base*height
Area of a circle is defined by the equation: A = pi * r2. pi = 3.14159 & r = 28. Substitute into the equation: A = 3.14159 * 282. Area = 2463 cm2.
You need the height as well to find the area, but the proper equation would be A= 5.5h
Area of rhombus = 0.5 times the product of its diagonals
area of the base*height