| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.10 |
| Score | 0% | 62% |
What is the area of a circle with a radius of 5?
| 7π | |
| 3π | |
| 25π | |
| 64π |
The formula for area is πr2:
a = πr2
a = π(52)
a = 25π
Breaking apart a quadratic expression into a pair of binomials is called:
squaring |
|
normalizing |
|
factoring |
|
deconstructing |
To factor a quadratic expression, apply the FOIL (First, Outside, Inside, Last) method in reverse.
A coordinate grid is composed of which of the following?
x-axis |
|
origin |
|
y-axis |
|
all of these |
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.
The dimensions of this trapezoid are a = 4, b = 7, c = 7, d = 2, and h = 2. What is the area?
| 14 | |
| 19\(\frac{1}{2}\) | |
| 9 | |
| 20 |
The area of a trapezoid is one-half the sum of the lengths of the parallel sides multiplied by the height:
a = ½(b + d)(h)
a = ½(7 + 2)(2)
a = ½(9)(2)
a = ½(18) = \( \frac{18}{2} \)
a = 9
The formula for the area of a circle is which of the following?
c = π d |
|
c = π r2 |
|
c = π r |
|
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.