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finlep [7]
3 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]3 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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Jose paid $2.50 for 3 apples. At this rate how much would he pay for 12 apples
Ber [7]

Divide 3 apples by $2.50 to get the unit price, $1.20 (The constant of proportionality)
Then multiply 12 apples by the constant ($1.20)
Your final answer should be $14.40

7 0
2 years ago
My number had a tens digit that is 8 more than the ones digit. Zero is not one of my digits
marin [14]

The tens digit is 8 more than the ones digit. There isn't any zeros.

The maximum digit is 9 because 10 would be 2 digits, 1 and 0.

So say the tens digits is 9.

9 _

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4 0
2 years ago
During the summer, Breanna works at a coffee shop. She saves 75% of her earnings to buy new school clothes. If Breanna earns $75
Westkost [7]

Answer: The best estimate for the amount of money she saves to buy clothes = $ 562.5

Step-by-step explanation:

Given: Breanna saves 75% of her earnings to buy new school clothes.

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The amount of money she saves to buy clothes = 75% of 750

= 0.75 x  750   [75%= 0.75]

= $ 562.5

Hence, the best estimate for the amount of money she saves to buy clothes =  $ 562.5

5 0
3 years ago
Find the area of the figure. Round your answer to the nearest hundredth, if necessary. (12cm)
Brilliant_brown [7]

Answer:

The answer is 56.52 square centimeters

Step-by-step explanation:

The area of a circle is Pi R^2 so that means the area of a semi circle is half of that which is Pi R^2/2

since diameter is 12, radius = 12/2 = 6

Area = (3.14 × 6^2)÷2 = 56.52

3 0
2 years ago
What’s 34.5 divided by 10.0
11111nata11111 [884]
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6 0
3 years ago
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