| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.37 |
| Score | 0% | 67% |
When two lines intersect, adjacent angles are __________ (they add up to 180°) and angles across from either other are __________ (they're equal).
supplementary, vertical |
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acute, obtuse |
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vertical, supplementary |
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obtuse, acute |
Angles around a line add up to 180°. Angles around a point add up to 360°. When two lines intersect, adjacent angles are supplementary (they add up to 180°) and angles across from either other are vertical (they're equal).
Simplify 9a x 8b.
| 72a2b2 | |
| 72ab | |
| 17ab | |
| 72\( \frac{a}{b} \) |
To multiply monomials, multiply the coefficients (the numbers that come before the variables) of each term, add the exponents of like variables, and multiply the different variables together.
9a x 8b = (9 x 8) (a x b) = 72ab
A trapezoid is a quadrilateral with one set of __________ sides.
parallel |
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equal angle |
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right angle |
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equal length |
A trapezoid is a quadrilateral with one set of parallel sides.
What is the circumference of a circle with a diameter of 9?
| 28π | |
| 9π | |
| 30π | |
| 26π |
The formula for circumference is circle diameter x π:
c = πd
c = 9π
On this circle, line segment CD is the:
radius |
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circumference |
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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).