| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.66 |
| Score | 0% | 73% |
If side x = 14cm, side y = 6cm, and side z = 6cm what is the perimeter of this triangle?
| 26cm | |
| 29cm | |
| 32cm | |
| 30cm |
The perimeter of a triangle is the sum of the lengths of its sides:
p = x + y + z
p = 14cm + 6cm + 6cm = 26cm
Solve for a:
a2 - a - 12 = 0
| -1 or -6 | |
| 8 or -7 | |
| 8 or -8 | |
| -3 or 4 |
The first step to solve a quadratic equation that's set to zero is to factor the quadratic equation:
a2 - a - 12 = 0
(a + 3)(a - 4) = 0
For this expression to be true, the left side of the expression must equal zero. Therefore, either (a + 3) or (a - 4) must equal zero:
If (a + 3) = 0, a must equal -3
If (a - 4) = 0, a must equal 4
So the solution is that a = -3 or 4
A right angle measures:
360° |
|
90° |
|
45° |
|
180° |
A right angle measures 90 degrees and is the intersection of two perpendicular lines. In diagrams, a right angle is indicated by a small box completing a square with the perpendicular lines.
What is the area of a circle with a radius of 4?
| 64π | |
| 16π | |
| 49π | |
| 3π |
The formula for area is πr2:
a = πr2
a = π(42)
a = 16π
If a = c = 2, b = d = 6, and the blue angle = 56°, what is the area of this parallelogram?
| 3 | |
| 15 | |
| 56 | |
| 12 |
The area of a parallelogram is equal to its length x width:
a = l x w
a = a x b
a = 2 x 6
a = 12