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High School Math : Pre-Algebra

Study concepts, example questions & explanations for High School Math

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8 Diagnostic Tests 613 Practice Tests Question of the Day Flashcards Learn by Concept

Example Questions

Example Question #13 : How To Find The Circumference Of A Circle In Pre Algebra

What is the circumference of a circle with a radius of ?

Possible Answers:

$1225\pi$

$70\pi$

$35\pi$

Correct answer:

$70\pi$

Explanation:

To find the circumference of a circle given the radius we must first know the equation for the circumference of a circle which is

We then plug in the number for the radius into the equation yielding

$C=2(35)(\pi)$

We multiply to find the value for the circumference is $70\pi$ .

The answer is $70\pi$ .

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Example Question #14 : How To Find The Circumference Of A Circle In Pre Algebra

What is the circumference of a circle with a radius of ?

Possible Answers:

$31\pi$

$72\pi$

$62\pi$

Correct answer:

$62\pi$

Explanation:

To find the circumference of a circle we must first know the equation for the circumference of a circle, which is $C=2\pi r$ .

We then plug in the given value for the radius, yielding $C=2(\pi)(31)$ .

We multiply to find the value for the circumference is $62\pi$ .

Thus answer is $62\pi$ .

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Example Question #15 : How To Find The Circumference Of A Circle In Pre Algebra

What is the circumference of a circle with a radius of ?

Possible Answers:

$C=64\pi$

$C=16\pi$

$C=24\pi$

$C=32\pi$

Correct answer:

$C=32\pi$

Explanation:

To find the circumference of a circle given the radius, we must first know the equation for the circumference of a circle which is

We then plug in for the radius into the equation yielding

$C=2(\pi)(16)$

We multiply to find the value for the circumference is

$C=32\pi$

The answer is $C=32\pi$ .

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Example Question #11 : How To Find The Circumference Of A Circle In Pre Algebra

Find the circumference of a circle with a diameter of 4 meters.

Possible Answers:

$16 \pi$ meters

$2 \pi$ meters

$4\pi$ meters

$\pi$ meters

$8 \pi$ meters

Correct answer:

$4\pi$ meters

Explanation:

The formula for circumference is:

$C = 2\pi r$ where is the radius of our circle

In this case, we were given the diameter of meters. Thus, we know that the radius is meters (since the diameter is twice the radius). Plugging this into the formula, we have:

$C = 2 \pi \cdot 2 = 4 \pi$ meters.

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Example Question #16 : How To Find The Circumference Of A Circle In Pre Algebra

What is the circumference of a circle with a radius of ?

Possible Answers:

$25\pi$

$6.25\pi$

$5\pi$

$7.5\pi$

$10\pi$

Correct answer:

$10\pi$

Explanation:

The formula for the circumference of a circle is $C=2\pi r$ .

Plug in our given values and solve.

$C=2\pi r$

$C=2\pi (5)$

$C=10\pi$

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Example Question #401 : Pre Algebra

What is the circumference of a circle with a radius of ?

Possible Answers:

$39\pi$

$13\pi$

$26\pi$

$169\pi$

Correct answer:

$26\pi$

Explanation:

To find the circumference of a circle, use the equation:

$Circumference=2\pi\cdot Radius$

Substitute the given value for the radius into the equation:

$Circumference=2\pi\cdot13$

$Circumference=26\pi$

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Example Question #402 : Pre Algebra

An ant is standing at the center of a perfectly circular plate. If the ant crawled in a straight line, he would have to crawl 6 inches to reach the edge of the plate. How many inches would he crawl if he crawled a full circle around the edge of the plate?

Possible Answers:

$12\pi$

$36\pi$

$3\pi$

$24\pi$

$6\pi$

Correct answer:

$12\pi$

Explanation:

We need to find the circumference:

$\text{circumference of a circle} = 2\pi r = d\pi$

In this formula stands for the radius and stands for the diameter.

The distance the ant must crawl to the edge from the center is the radius of the circle.

Plug in 6 inches for :

$\text{circumference of a circle} = 2\pi r = 2*\pi*6 = 12\pi$

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Example Question #403 : Pre Algebra

If a circle has a radius of meters, what is its circumference?

Possible Answers:

$8\pi\ m$

$16\pi\ m$

$32\pi\ m$

$2\pi\ m$

$4\pi\ m$

Correct answer:

$8\pi\ m$

Explanation:

The formula for the circumference of a circle is ${\pi}d$ , where is the diameter. This can also be written as $2{\pi}r$ , where is the radius of the circle. We were given the radius, so we take the second formula and plug in for .

$2{\pi}r = 2{\pi}(4) = 8{\pi}\ \textup{meters}=8\pi\ m$

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Example Question #1 : How To Find The Area Of A Square In Pre Algebra

Find the area of a square with a side of 10 inches.

Possible Answers:

$100\ in^{2}$

$80\ in^{2}$

$10\ in^{2}$

$40\ in^{2}$

$16\ in^{2}$

Correct answer:

$100\ in^{2}$

Explanation:

The formula for the area of a square is s^2 . Therefore, square 10 and you get 100. Make sure your units are squared.

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Example Question #2 : How To Find The Area Of A Square In Pre Algebra

What is the area of a square with a side length of ?

Possible Answers:

144

Correct answer:

144

Explanation:

To find the area we square the side length $A=s^{2}$

In this case we square to get $A=12^{2}$ .

The answer for the area in this example is 144 .

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High School Math : Pre-Algebra

Study concepts, example questions & explanations for High School Math

All High School Math Resources

Example Questions

Example Question #13 : How To Find The Circumference Of A Circle In Pre Algebra

Example Question #14 : How To Find The Circumference Of A Circle In Pre Algebra

Example Question #15 : How To Find The Circumference Of A Circle In Pre Algebra

Example Question #11 : How To Find The Circumference Of A Circle In Pre Algebra

Example Question #16 : How To Find The Circumference Of A Circle In Pre Algebra

Example Question #401 : Pre Algebra

Example Question #402 : Pre Algebra

Example Question #403 : Pre Algebra

Example Question #1 : How To Find The Area Of A Square In Pre Algebra

Example Question #2 : How To Find The Area Of A Square In Pre Algebra

All High School Math Resources

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