13
QuizMultiple Choice

Equation of a Circle — Quiz

Question 13 • Integrated Math II CR SUSD (EX)

A sprinkler is designed to water a circular area that has a radius of 7 feet. The sprinkler is located at 0 comma 0 on a lawn. A flowerbed is planted 3 feet east and 6 feet south of the sprinkler. Determine if the distance from the flowerbed to the sprinkler places the flowerbed on or within the circular area that this sprinkler can water.

Answer
A
Yes. The flowerbed is square root of 45 feet away from the sprinkler, which is less than the 7 -foot radius.
B
No. The flowerbed is 18 feet away from the sprinkler, which is more than the 7 -foot radius.
C
No. The flowerbed is 9 feet away from the sprinkler, which is more than the 7 -foot radius.
D
Yes. The flowerbed is exactly 7 feet away from the sprinkler.

Explanation

Use the distance formula from the sprinkler at (0, 0) to the flowerbed at (3, −6): the distance is √(3² + (−6)²) = √45, or about 6.7 feet. Since 6.7 feet is less than the sprinkler’s 7-foot radius, the flowerbed is within the circular watering area. Choice A correctly gives this distance and conclusion.

AI-written and checked against the verified answer.

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