Question

What is the best approximation for the area of a circle with a diameter of 19 meters?
Use 3.14 to approximate pi.


29.8 m²

59.7 m²

283.4 m²

889.9 m²

Answer 1

Area of a circle = $\pi r^2$, where r= radius of the circle.
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Given, diameter of the circle is 19m
$\text{Radius}= \frac{\text{Diameter}}{2}= \frac{19}{2}=9.5m$

Plug in r=9.5m and $\pi =3.14$ in the formula:
Area of the circle = $\pi r^2=3.14(9.5)^2=3.14(90.25)=283.385=283.4m^2$

Answer: 3rd option $283.4m^2$

Answer 2

As given diameter d=19m and area of the circle=pi×r2
Pi=3.14
r=d/2=19/2=9.5m
Area of circle=pi×r2=3.14×(9.5m)2=283.4m2
So third option is correct.