| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.34 |
| Score | 0% | 67% |
If the base of this triangle is 1 and the height is 1, what is the area?
| 72 | |
| \(\frac{1}{2}\) | |
| 98 | |
| 56 |
The area of a triangle is equal to ½ base x height:
a = ½bh
a = ½ x 1 x 1 = \( \frac{1}{2} \) = \(\frac{1}{2}\)
Which of the following statements about a triangle is not true?
sum of interior angles = 180° |
|
area = ½bh |
|
perimeter = sum of side lengths |
|
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.
The dimensions of this cube are height (h) = 7, length (l) = 2, and width (w) = 4. What is the surface area?
| 100 | |
| 352 | |
| 102 | |
| 142 |
The surface area of a cube is (2 x length x width) + (2 x width x height) + (2 x length x height):
sa = 2lw + 2wh + 2lh
sa = (2 x 2 x 4) + (2 x 4 x 7) + (2 x 2 x 7)
sa = (16) + (56) + (28)
sa = 100
Simplify 5a x 8b.
| 40a2b2 | |
| 13ab | |
| 40ab | |
| 40\( \frac{b}{a} \) |
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.
5a x 8b = (5 x 8) (a x b) = 40ab
What is 9a + 6a?
| 15a | |
| 54a | |
| 15 | |
| 54a2 |
To combine like terms, add or subtract the coefficients (the numbers that come before the variables) of terms that have the same variable raised to the same exponent.
9a + 6a = 15a