| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.63 |
| Score | 0% | 53% |
The formula for the area of a circle is which of the following?
c = π r2 |
|
c = π r |
|
c = π d2 |
|
c = π d |
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.
If angle a = 54° and angle b = 66° what is the length of angle c?
| 112° | |
| 60° | |
| 85° | |
| 77° |
The sum of the interior angles of a triangle is 180°:
180° = a° + b° + c°
c° = 180° - a° - b°
c° = 180° - 54° - 66° = 60°
The dimensions of this trapezoid are a = 6, b = 4, c = 8, d = 8, and h = 5. What is the area?
| 18 | |
| 22\(\frac{1}{2}\) | |
| 30 | |
| 22 |
The area of a trapezoid is one-half the sum of the lengths of the parallel sides multiplied by the height:
a = ½(b + d)(h)
a = ½(4 + 8)(5)
a = ½(12)(5)
a = ½(60) = \( \frac{60}{2} \)
a = 30
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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obtuse, acute |
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vertical, supplementary |
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).
Solve for x:
x - 2 = -3 - 3x
| -1\(\frac{2}{7}\) | |
| -\(\frac{1}{2}\) | |
| \(\frac{2}{5}\) | |
| -\(\frac{1}{4}\) |
To solve this equation, repeatedly do the same thing to both sides of the equation until the variable is isolated on one side of the equal sign and the answer on the other.
x - 2 = -3 - 3x
x = -3 - 3x + 2
x + 3x = -3 + 2
4x = -1
x = \( \frac{-1}{4} \)
x = -\(\frac{1}{4}\)