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3 years ago

The diameter of a circle is 36 inches. What is the circle's area?

Mathematics

2 answers:

HACTEHA [7]3 years ago

5 0

<h3><u>Answer</u><u>:</u></h3>

1,017.36 in²

<h3><u>Solution</u><u>:</u></h3>

The area of the circle is the region occupied by it in the two dimensional plane.

Area of a circle is given by ;

➝ πr²

The diameter of the circle is 36inches

‎ㅤ‎ㅤ‎ㅤ➙ Radius = D / 2

‎ㅤ‎ㅤ‎ㅤ➙ Radius = 36 / 2

‎ㅤ‎ㅤ‎ㅤ➙ Radius = 18 inches

<em><u>Therefore, area :</u></em>

➝ A = πr²

➝ A = 3.14 × ( 18 )²

➝ A = 3.14 × 324

➝ A = 1017.36

Anettt [7]3 years ago

3 0

Solution:

Diameter of circle = 36 in.
Radius of circle = Diameter/2 in.
Area of circle = πr²

<u>Finding the radius of the circle:</u>

Radius of circle = Diameter/2 in.
=> Radius of circle = 36/2 in.
=> Radius of circle = 18 in.

<u>Finding the area of the circle:</u>

Area of circle = πr²
=> Area of circle = (3.14)(18²)
=> Area of circle = (3.14)(324)
=> Area of circle = 3.14 x 324 = 1017.36 in²

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For this case the estimated proportion of people who responded that they have a plan to buy one electric car is given by:

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We know that the confidence level for this case is 96% of confidence, then our significance level would be $\alpha=1-0.96=0.04$ and $\alpha/2 =0.02$ . And the critical value would be:

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Replacing the data given we got:

$0.212 - 2.05\sqrt{\frac{0.212(1-0.212)}{85}}=0.121$

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DerKrebs [107]

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