| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.39 |
| Score | 0% | 68% |
When two lines intersect, adjacent angles are __________ (they add up to 180°) and angles across from either other are __________ (they're equal).
acute, obtuse |
|
vertical, supplementary |
|
obtuse, acute |
|
supplementary, vertical |
Angles around a line add up to 180°. Angles around a point add up to 360°. When two lines intersect, adjacent angles are supplementary (they add up to 180°) and angles across from either other are vertical (they're equal).
If the base of this triangle is 8 and the height is 7, what is the area?
| 52 | |
| 39 | |
| 28 | |
| 31\(\frac{1}{2}\) |
The area of a triangle is equal to ½ base x height:
a = ½bh
a = ½ x 8 x 7 = \( \frac{56}{2} \) = 28
A trapezoid is a quadrilateral with one set of __________ sides.
right angle |
|
parallel |
|
equal length |
|
equal angle |
A trapezoid is a quadrilateral with one set of parallel sides.
What is the circumference of a circle with a radius of 2?
| 34π | |
| 4π | |
| 11π | |
| 16π |
The formula for circumference is circle diameter x π. Circle diameter is 2 x radius:
c = πd
c = π(2 * r)
c = π(2 * 2)
c = 4π
What is 8a + 9a?
| 17 | |
| a2 | |
| 72a | |
| 17a |
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.
8a + 9a = 17a