Answered

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A given circle has an approximate area of 78.5 square units. How long is the circles diameter?

Sagot :

Remember that

The area of a circle is equal to

[tex]A=\pi\cdot r^2[/tex]

we have

A=78.5 unit2

I will assume pi=3.14

substitute in the formula

[tex]\begin{gathered} 78.5=3.14\cdot r^2 \\ r^2=\frac{78.5}{3.14} \\ r=5\text{ units} \end{gathered}[/tex]

the diameter is two times the radius

so

D=2(5)=10 units

therefore

The diameter is 10 units

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