| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.04 |
| Score | 0% | 61% |
The formula for the area of a circle is which of the following?
a = π d2 |
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a = π r2 |
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a = π r |
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a = 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 = 26° and angle b = 59° what is the length of angle d?
| 118° | |
| 133° | |
| 154° | |
| 123° |
An exterior angle of a triangle is equal to the sum of the two interior angles that are opposite:
d° = b° + c°
To find angle c, remember that the sum of the interior angles of a triangle is 180°:
180° = a° + b° + c°
c° = 180° - a° - b°
c° = 180° - 26° - 59° = 95°
So, d° = 59° + 95° = 154°
A shortcut to get this answer is to remember that angles around a line add up to 180°:
a° + d° = 180°
d° = 180° - a°
d° = 180° - 26° = 154°
Solve for a:
-6a + 6 > -7 + 4a
| a > 1\(\frac{3}{10}\) | |
| a > -\(\frac{1}{2}\) | |
| a > -\(\frac{1}{6}\) | |
| a > \(\frac{1}{2}\) |
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 > sign and the answer on the other.
-6a + 6 > -7 + 4a
-6a > -7 + 4a - 6
-6a - 4a > -7 - 6
-10a > -13
a > \( \frac{-13}{-10} \)
a > 1\(\frac{3}{10}\)
A trapezoid is a quadrilateral with one set of __________ sides.
equal length |
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equal angle |
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parallel |
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right angle |
A trapezoid is a quadrilateral with one set of parallel sides.
If the length of AB equals the length of BD, point B __________ this line segment.
bisects |
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midpoints |
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intersects |
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trisects |
A line segment is a portion of a line with a measurable length. The midpoint of a line segment is the point exactly halfway between the endpoints. The midpoint bisects (cuts in half) the line segment.