There are different formulae for the perimeter, area or other aspects of each shape. Furthermore, the formula may well depend on what information is available to you.
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circle triangle square rectangle trapezoid
Use the standard formula to calculate the area of the circle, then you can compare with the area given for the triangle. Note 1: The formula for a circle is: area = pi x radius squared Note 2: The radius is half the diameter
r2(square)
A circle perhaps?
triangle circle square octagon pentagon hexagon trapezoid