| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.40 |
| Score | 0% | 68% |
On this circle, a line segment connecting point A to point D is called:
diameter |
|
circumference |
|
radius |
|
chord |
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).
What is 9a - 9a?
| 18a2 | |
| 0a | |
| 2 | |
| 81a2 |
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 - 9a = 0a
If a = 9, b = 2, c = 5, and d = 5, what is the perimeter of this quadrilateral?
| 18 | |
| 16 | |
| 21 | |
| 13 |
Perimeter is equal to the sum of the four sides:
p = a + b + c + d
p = 9 + 2 + 5 + 5
p = 21
What is the circumference of a circle with a radius of 7?
| 12π | |
| 28π | |
| 14π | |
| 7π |
The formula for circumference is circle diameter x π. Circle diameter is 2 x radius:
c = πd
c = π(2 * r)
c = π(2 * 7)
c = 14π
Solve for b:
8b - 6 < -5 - 4b
| b < -1 | |
| b < 2 | |
| b < \(\frac{1}{12}\) | |
| b < -4 |
To solve this equation, repeatedly do the same thing to both sides of the equation until the variable is isolated on one side of the < sign and the answer on the other.
8b - 6 < -5 - 4b
8b < -5 - 4b + 6
8b + 4b < -5 + 6
12b < 1
b < \( \frac{1}{12} \)
b < \(\frac{1}{12}\)