| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.51 |
| Score | 0% | 70% |
Which of the following statements about a triangle is not true?
exterior angle = sum of two adjacent interior angles |
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area = ½bh |
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sum of interior angles = 180° |
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perimeter = sum of side lengths |
A triangle is a three-sided polygon. It has three interior angles that add up to 180° (a + b + c = 180°). An exterior angle of a triangle is equal to the sum of the two interior angles that are opposite (d = b + c). The perimeter of a triangle is equal to the sum of the lengths of its three sides, the height of a triangle is equal to the length from the base to the opposite vertex (angle) and the area equals one-half triangle base x height: a = ½ base x height.
If a = 2, b = 1, c = 3, and d = 6, what is the perimeter of this quadrilateral?
| 25 | |
| 23 | |
| 12 | |
| 13 |
Perimeter is equal to the sum of the four sides:
p = a + b + c + d
p = 2 + 1 + 3 + 6
p = 12
The dimensions of this cube are height (h) = 5, length (l) = 1, and width (w) = 9. What is the volume?
| 392 | |
| 81 | |
| 45 | |
| 2 |
The volume of a cube is height x length x width:
v = h x l x w
v = 5 x 1 x 9
v = 45
Solve for z:
z - 5 > -8 - 8z
| z > -7 | |
| z > -\(\frac{1}{3}\) | |
| z > 2 | |
| z > -\(\frac{1}{7}\) |
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.
z - 5 > -8 - 8z
z > -8 - 8z + 5
z + 8z > -8 + 5
9z > -3
z > \( \frac{-3}{9} \)
z > -\(\frac{1}{3}\)
A trapezoid is a quadrilateral with one set of __________ sides.
right angle |
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equal angle |
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parallel |
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equal length |
A trapezoid is a quadrilateral with one set of parallel sides.