| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.73 |
| Score | 0% | 55% |
The formula for the area of a circle is which of the following?
c = π d2 |
|
c = π d |
|
c = π r2 |
|
c = π r |
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.
What is the area of a circle with a radius of 4?
| 9π | |
| 81π | |
| 16π | |
| 36π |
The formula for area is πr2:
a = πr2
a = π(42)
a = 16π
On this circle, line segment AB is the:
chord |
|
diameter |
|
circumference |
|
radius |
A circle is a figure in which each point around its perimeter is an equal distance from the center. The radius of a circle is the distance between the center and any point along its perimeter. A chord is a line segment that connects any two points along its perimeter. The diameter of a circle is the length of a chord that passes through the center of the circle and equals twice the circle's radius (2r).
Solve 8b - 8b = 7b - 3x + 8 for b in terms of x.
| -\(\frac{7}{15}\)x - \(\frac{4}{15}\) | |
| 5x + 8 | |
| x + 1\(\frac{1}{3}\) | |
| \(\frac{1}{3}\)x - \(\frac{7}{9}\) |
To solve this equation, isolate the variable for which you are solving (b) on one side of the equation and put everything else on the other side.
8b - 8x = 7b - 3x + 8
8b = 7b - 3x + 8 + 8x
8b - 7b = -3x + 8 + 8x
b = 5x + 8
The formula for the area of a circle is which of the following?
a = π r2 |
|
a = π d2 |
|
a = π d |
|
a = π r |
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.