| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.56 |
| Score | 0% | 71% |
The formula for the area of a circle is which of the following?
a = π d2 |
|
a = π r |
|
a = π d |
|
a = π r2 |
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.
A coordinate grid is composed of which of the following?
x-axis |
|
origin |
|
all of these |
|
y-axis |
The coordinate grid is composed of a horizontal x-axis and a vertical y-axis. The center of the grid, where the x-axis and y-axis meet, is called the origin.
If the base of this triangle is 4 and the height is 9, what is the area?
| 21 | |
| 63 | |
| 90 | |
| 18 |
The area of a triangle is equal to ½ base x height:
a = ½bh
a = ½ x 4 x 9 = \( \frac{36}{2} \) = 18
If a = c = 4, b = d = 3, and the blue angle = 64°, what is the area of this parallelogram?
| 15 | |
| 25 | |
| 42 | |
| 12 |
The area of a parallelogram is equal to its length x width:
a = l x w
a = a x b
a = 4 x 3
a = 12
Simplify (2a)(5ab) - (9a2)(4b).
| 46a2b | |
| -26a2b | |
| 26ab2 | |
| 91ab2 |
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.
(2a)(5ab) - (9a2)(4b)
(2 x 5)(a x a x b) - (9 x 4)(a2 x b)
(10)(a1+1 x b) - (36)(a2b)
10a2b - 36a2b
-26a2b