| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.76 |
| Score | 0% | 55% |
The formula for the area of a circle is which of the following?
c = π d |
|
c = π r2 |
|
c = π r |
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c = π d2 |
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.
Simplify (7a)(4ab) + (9a2)(6b).
| 165a2b | |
| 26a2b | |
| 82ab2 | |
| 82a2b |
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.
(7a)(4ab) + (9a2)(6b)
(7 x 4)(a x a x b) + (9 x 6)(a2 x b)
(28)(a1+1 x b) + (54)(a2b)
28a2b + 54a2b
82a2b
If angle a = 55° and angle b = 44° what is the length of angle c?
| 81° | |
| 87° | |
| 90° | |
| 92° |
The sum of the interior angles of a triangle is 180°:
180° = a° + b° + c°
c° = 180° - a° - b°
c° = 180° - 55° - 44° = 81°
If the base of this triangle is 5 and the height is 5, what is the area?
| 70 | |
| 52 | |
| 55 | |
| 12\(\frac{1}{2}\) |
The area of a triangle is equal to ½ base x height:
a = ½bh
a = ½ x 5 x 5 = \( \frac{25}{2} \) = 12\(\frac{1}{2}\)
Which of the following statements about a triangle is not true?
exterior angle = sum of two adjacent interior angles |
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sum of interior angles = 180° |
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area = ½bh |
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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.