| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.00 |
| Score | 0% | 60% |
If angle a = 38° and angle b = 30° what is the length of angle c?
| 112° | |
| 81° | |
| 105° | |
| 52° |
The sum of the interior angles of a triangle is 180°:
180° = a° + b° + c°
c° = 180° - a° - b°
c° = 180° - 38° - 30° = 112°
Which types of triangles will always have at least two sides of equal length?
equilateral, isosceles and right |
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isosceles and right |
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equilateral and right |
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equilateral and isosceles |
An isosceles triangle has two sides of equal length. An equilateral triangle has three sides of equal length. In a right triangle, two sides meet at a right angle.
Solve 3c + 8c = 2c - 5y - 9 for c in terms of y.
| -\(\frac{3}{5}\)y + \(\frac{1}{5}\) | |
| \(\frac{1}{10}\)y - \(\frac{4}{5}\) | |
| -13y - 9 | |
| \(\frac{1}{2}\)y + 2 |
To solve this equation, isolate the variable for which you are solving (c) on one side of the equation and put everything else on the other side.
3c + 8y = 2c - 5y - 9
3c = 2c - 5y - 9 - 8y
3c - 2c = -5y - 9 - 8y
c = -13y - 9
Simplify 9a x 3b.
| 27ab | |
| 27\( \frac{a}{b} \) | |
| 27\( \frac{b}{a} \) | |
| 27a2b2 |
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 3b = (9 x 3) (a x b) = 27ab
Which of the following statements about a triangle is not true?
area = ½bh |
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sum of interior angles = 180° |
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exterior angle = sum of two adjacent interior angles |
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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.