3 years ago

The radius of a sphere measures 2 units What is its surface area?

Mathematics

2 answers:

garik1379 [7]3 years ago

8 0

Answer:

A=50.265

Step-by-step explanation:

$4\pi {r}^{2}$

$4\pi {2}^{2} = 50.265482446$

Andrew [12]3 years ago

7 0

Answer:

Step-by-step explanation:

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Alecsey [184]

Answer:

x = 50/9

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3 years ago

The area of a circle varies directly as the square of its radius. A circle with radius 2 in. Has area 12.568 in.^2 . What is the

Dafna11 [192]

Answer:

$A_2=128.69\ in^2$

Step-by-step explanation:

The area of a circle varies directly as the square of its radius.

$A=\pi r^2$

If r₁ = 2in, A₁ = 12.568 in₂, r₂ = 6.4 in, A₂ = ?

ATQ,

$\dfrac{A_1}{A_2}=\dfrac{r_1^2}{r_2^2}\\\\A_2=\dfrac{A_1r_2^2}{r_1^2}\\\\A_2=\dfrac{12.568 \times 6.4^2}{2^2}\\\\=128.69\ in^2$

So, the new area of the circle is $128.69\ in^2$ .

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3 years ago

Katie is about to list her house as For Sale By Owner. Suppose she needs to allow for a 5% commission for the buyer's realtor, a

sineoko [7]

Answer:

Step-by-step explanation:

200,000 nearest dollar

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3 years ago

The volume of the pyramid shown is 70 m3.

Ne4ueva [31]

Answer:

The height of the pyramid is 5m

Step-by-step explanation:

To calculate the heigth of a pyramid we have to use the following formula:

v = volume = 70 m³

w = width = 6 m

l = length = 7 m

h = height

v = (w * l * h) / 3

we replace the values that we know

70m³ = (6m * 7m * h) / 3

70m³ * 3 = 42m² * h

210m³ / 42m² = h

5m = h

The height of the pyramid is 5m

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3 years ago

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What is the definition of significant digits?

eduard

Answer:

Digits that should be written when doing calculations

-by-step explanation:

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