| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.03 |
| Score | 0% | 61% |
Order the following types of angle from least number of degrees to most number of degrees.
acute, right, obtuse |
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acute, obtuse, right |
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right, obtuse, acute |
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right, acute, obtuse |
An acute angle measures less than 90°, a right angle measures 90°, and an obtuse angle measures more than 90°.
What is the area of a circle with a radius of 2?
| 5π | |
| 7π | |
| 16π | |
| 4π |
The formula for area is πr2:
a = πr2
a = π(22)
a = 4π
Simplify (6a)(5ab) + (3a2)(6b).
| 48ab2 | |
| -12a2b | |
| 48a2b | |
| -12ab2 |
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.
(6a)(5ab) + (3a2)(6b)
(6 x 5)(a x a x b) + (3 x 6)(a2 x b)
(30)(a1+1 x b) + (18)(a2b)
30a2b + 18a2b
48a2b
Solve 3c + 3c = 2c + y + 6 for c in terms of y.
| -2y + 6 | |
| -3y + 1 | |
| 1\(\frac{3}{5}\)y + \(\frac{7}{10}\) | |
| -y - 2\(\frac{1}{3}\) |
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 + 3y = 2c + y + 6
3c = 2c + y + 6 - 3y
3c - 2c = y + 6 - 3y
c = -2y + 6
Which of the following statements about a triangle is not true?
area = ½bh |
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perimeter = sum of side lengths |
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exterior angle = sum of two adjacent interior angles |
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sum of interior angles = 180° |
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.