| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.11 |
| Score | 0% | 62% |
Which of the following statements about a triangle is not true?
sum of interior angles = 180° |
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area = ½bh |
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perimeter = sum of side lengths |
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exterior angle = sum of two adjacent interior angles |
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.
Solve for b:
-b - 2 > -4 - 9b
| b > -1\(\frac{1}{2}\) | |
| b > -\(\frac{5}{8}\) | |
| b > -1\(\frac{1}{3}\) | |
| b > -\(\frac{1}{4}\) |
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 > sign and the answer on the other.
-b - 2 > -4 - 9b
-b > -4 - 9b + 2
-b + 9b > -4 + 2
8b > -2
b > \( \frac{-2}{8} \)
b > -\(\frac{1}{4}\)
A(n) __________ is to a parallelogram as a square is to a rectangle.
triangle |
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quadrilateral |
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rhombus |
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trapezoid |
A rhombus is a parallelogram with four equal-length sides. A square is a rectangle with four equal-length sides.
What is the area of a circle with a radius of 5?
| 81π | |
| 25π | |
| 7π | |
| 36π |
The formula for area is πr2:
a = πr2
a = π(52)
a = 25π
If AD = 19 and BD = 12, AB = ?
| 14 | |
| 2 | |
| 19 | |
| 7 |
The entire length of this line is represented by AD which is AB + BD:
AD = AB + BD
Solving for AB:AB = AD - BD