| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.26 |
| Score | 0% | 65% |
The formula for the area of a circle is which of the following?
a = π r2 |
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a = π d2 |
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a = π d |
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a = π r |
The circumference of a circle is the distance around its perimeter and equals π (approx. 3.14159) x diameter: c = π d. The area of a circle is π x (radius)2 : a = π r2.
Which of the following is not a part of PEMDAS, the acronym for math order of operations?
exponents |
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pairs |
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division |
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addition |
When solving an equation with two variables, replace the variables with the values given and then solve the now variable-free equation. (Remember order of operations, PEMDAS, Parentheses, Exponents, Multiplication/Division, Addition/Subtraction.)
Solve -4c - c = -5c - 7z - 1 for c in terms of z.
| -6z - 1 | |
| -1\(\frac{1}{13}\)z + \(\frac{2}{13}\) | |
| 4z - 1 | |
| -\(\frac{1}{5}\)z + 1\(\frac{3}{5}\) |
To solve this equation, isolate the variable for which you are solving (c) on one side of the equation and put everything else on the other side.
-4c - z = -5c - 7z - 1
-4c = -5c - 7z - 1 + z
-4c + 5c = -7z - 1 + z
c = -6z - 1
On this circle, line segment AB is the:
circumference |
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radius |
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chord |
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diameter |
A circle is a figure in which each point around its perimeter is an equal distance from the center. The radius of a circle is the distance between the center and any point along its perimeter. A chord is a line segment that connects any two points along its perimeter. The diameter of a circle is the length of a chord that passes through the center of the circle and equals twice the circle's radius (2r).
The dimensions of this cylinder are height (h) = 7 and radius (r) = 3. What is the surface area?
| 60π | |
| 324π | |
| 32π | |
| 72π |
The surface area of a cylinder is 2πr2 + 2πrh:
sa = 2πr2 + 2πrh
sa = 2π(32) + 2π(3 x 7)
sa = 2π(9) + 2π(21)
sa = (2 x 9)π + (2 x 21)π
sa = 18π + 42π
sa = 60π