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3 years ago

The area of a circle is 16 π cm 2 . What is the circle's circumference?

Mathematics

1 answer:

Andrej [43]3 years ago

5 0

A=piR^2
16pi=piR^2 So R=4cm

C=2piR
C=8pi cm

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3 years ago

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4 years ago

13) -3x - 4y = 8 -4x - 3y=6

Dvinal [7]

Answer:

x = 0, y = -2

Step-by-step explanation:

-3x - 4y = 8 (1)

-4x - 3y=6 (2)

Multiply (1) by -4 and (2) by -3, we have:

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4 years ago

if 1 gallon of paint covers 400 square feet, about how many gallons of paint are needed to paint the outside of a spherical tank

ollegr [7]

Given:
Diameter if the spherical tank = 20 ft.
Now,
We know,
radius = diameter / 2
= 20 / 2
= 10 ft.
Now,
The area of the spherical tank = $4 \pi r^{2}$

= $4 \pi (10)^{2}$

= $4 * \pi *100$

= $1256.637061$

= $1256.64~ft^2-->rounded$

Now,
According to the question,
400 ft² needs 1 gallon of paint
1 ft² needs (1 / 400) gallon of paint
1256.64 ft² needs (1 / 400) * 1256.64 gallon of paint
= 3.1416 gallon of paint
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4 years ago

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nignag [31]

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3 years ago

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