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finlep [7]
4 years ago
15

A sphere has a radius of r. What is the area of a cross section taken at a distance of 1/2r from the center of the sphere?

Mathematics
1 answer:
OlgaM077 [116]4 years ago
6 0

Answer:

D. ¾ πr²

Step-by-step explanation:

If r is the radius of the sphere, and R is the radius of circular cross section, then:

r² = (½ r)² + R²

r² = ¼ r² + R²

¾ r² = R²

So the area of the circular cross section is:

A = πR²

A = ¾ πr²

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Answer:

249.6

Step-by-step explanation

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How many square inches are in 60 square feet
Dahasolnce [82]

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Step-by-step explanation: 60 square feet would be 8640.

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3 years ago
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blagie [28]

Answer:

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Step-by-step explanation:

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3 years ago
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Lucy is going to walk in a fundraising event to raise money for her school band. Her mother has agreed to donate $7.50 to the sc
Readme [11.4K]

Answer: y = $7.50x + $25

Step-by-step explanation:

From the question, we are informed that Lucy is going to walk in a fundraising event to raise money for her school band and her mother has agreed to donate $7.50 to the school for each mile that Lucy walks, plus an additional $25.

The equation that represents y, the total amount of money Lucy's mother will donate if Lucy walks x miles during the event will be:

= ($.750 × x) + $25

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Since Lucy walks x Mike's, we multiply x by $7.50 and then add the answer to the additional $25 which is the answer gotten above.

7 0
4 years ago
Sebastian received 200 in holiday presents.He deposited 70% of that money in his bank account. How much did he put his bank acco
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Answer:

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Step-by-step explanation:

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