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Area of a circleThe formula for the area of a circle is: A = pi × r2 If r is known, simply substitute the known value for r in the formula. Use 3.14 for pi.
1) Calculate A if r = 4 inches A = pi × r2 = 3.14 × 42 = 3.14 ×16 = 50.24 inches2 Notice that the unit (inches) is squared to show that it was multiplied by itself twice 2) Calculate A if r = 6 inches A = pi × r2 = 3.14 × 62 = 3.14 ×36 = 103.04 inches2 If A = 78.5 inches2, find r Review solving multiplication equations before looking at the solution below.  Use the calculator below to find the area Fun math game: Destroy numbered balls by adding to 10
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