Question

Jim bought a round picnic table. The diameter of this table is 12. What is the area and circumference of Jim’s picnic table?

Answer 1

The circumference of the table is 12π, or about 37.7.
this is because the formula for circumference is dπ (diameter x pi)
the area is about 36π, or about 113.1.
this is because the equation for area of a circle is πr² (pi x radius-squared)
so, the radius of the circle is 6, since the radius is half the diameter.
we put this in for "r" and have π6² (pi x 6-squared)
6² = 36.
we can either leave it in pi or multiply it to get the rounded answer. :)

Answer 2

The equation for area is pi times r^2.
Here the diameter is 12, so the radius would be 6. (Diameter is twice the radius.)
Substituted this is pi times 6^2.
The area for the picnic table is about 113.097
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The equation for circumference is 2 times pi times r.
Substitute, 2 times pi times 6.
The circumference is about 37.699