Find the circumference of a circular pizza with a diameter of 33 inches. Round to the nearest tenth
Find the circumference of a circular pizza with a diameter of 33 inches.
Round to the nearest tenth.
We’re looking for the circumference of this pizza — the distance all
the way around. We find circumference by multiplying 𝜋 times the diameter or by multiplying
two times 𝜋 times the radius. In this problem, they told us the diameter was 33
inches. So let’s use 𝜋 times the diameter to solve for circumference.
Circumference equals 𝜋 times the diameter. The diameter of this pizza is 33 inches. I use my calculator to
multiply 𝜋 times 33 inches. My calculator gives me 103.6725, and it continues on and on. But this question has asked us to round to the
nearest tenth. There is a six currently in the tenth position. And we will look at the number to the
right of the tenth to see should we round up or keep this number the same.
If the number to the right of our tenth place is between zero and four, we do not round up. If that value is between
five and nine, we will round up. Seven is greater than five, which means we need to round our
tenth place up. The circumference of this pizza is 103.7 inches, and that is quite a large pizza.
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