A pizza is in the shape of a circle. If the radius of the pizza is 20.4 cm, find the surface area of the pizza.Round your answer to the nearest whole number. Do not type the units in the space below.
Question
A pizza is in the shape of a circle. If the radius of the pizza is 20.4 cm, find the surface area of the pizza.Round your answer to the nearest whole number. Do not type the units in the space below.
Solution
The formula for the surface area of a circle is A = πr², where r is the radius of the circle.
Step 1: Substitute the given radius into the formula. The radius r is 20.4 cm.
A = π(20.4 cm)²
Step 2: Square the radius.
A = π(416.16 cm²)
Step 3: Multiply the squared radius by π (approximately 3.14159).
A = 1306.84 cm²
Step 4: Round the result to the nearest whole number.
The surface area of the pizza is approximately 1307.
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