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3 years ago

Whats the area of a circle with a circumference of 31.4unit

Mathematics

1 answer:

marin [14]3 years ago

8 1

Answer:

78.54

Step-by-step explanation:

first you have to divided 31.4 by 3.14 to get your diameter so you can get your radius. 31.4 divided by 3.14 equals 10 and 10 divided by 2 equals 5 which is you radius. The formula for area for a circle is πr². 5 squared is 25 and 3.14 times 25 equals 78 .54 which is your answer.

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What is the value of n in this proportion? 8/12 = 10/n

Mademuasel [1]

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Help. Does anyone know how to do this?

tatuchka [14]

Answer:

x = 12, so PTQ = 40 deg

Step-by-step explanation:

first, because the two are vertically opposite, they are equal, write a formula for this:

x + 28 = 2x + 16 (minus 2x from both sides)

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sub into formula:

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3 years ago

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defon

Answer:

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3 years ago

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The gasoline gauge read 1/4 full. When 12 gallons were added to the tank the gauge read 3/4 full. How many more gallons to fill

DedPeter [7]

Initially, 1/4 of the tank was filled.

After adding 12 gallons, it was 3/4 full.

Increase in fuel filled portion =
$\frac{3}{4} - \frac{1}{4} = \frac{3 - 1}{4} = \frac{2}{4} \\$

So 2/4 of the tank = 12 gallons

1/4 of tank = 12 ÷ 2 = 6 gallons

4/4 of tank = 6×4 = 24 gallons
____________________

Portion remaining to be filled =

$1 - \frac{3}{4} = \frac{4 - 3}{4} = \frac{1}{4} \\$

Fuel needed = 1/4 × 24 = 6 gallons

So you need 6 more gallons to fill the tank

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3 years ago