Question

Find the area of a circle with diameter 10cm use the value 3.14

Answer 1

78.5 cm^2

`solution \\ diameter = 10 \: cm \\ radius = (10)/(2) = 5 \: cm \\ area \: of \: circle = \pi \: {r}^(2) \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 3.14 * {5}^(2) \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 3.14 * 5 * 5 \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 3.14 * 25 \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 78.5 {cm}^(2)`

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Answer 2

78.5 cm

Explanation:

The area of a circle is represented by A = πr². Since we are replacing the value of pi(π) with 3.14, and the diameter is 10, meaning the radius(r) is 5, we can plug both values into the equation, to get A = 3.14(5^2). This simplifies to 78.5.