| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.74 |
| Score | 0% | 75% |
If side x = 11cm, side y = 9cm, and side z = 10cm what is the perimeter of this triangle?
| 30cm | |
| 21cm | |
| 32cm | |
| 31cm |
The perimeter of a triangle is the sum of the lengths of its sides:
p = x + y + z
p = 11cm + 9cm + 10cm = 30cm
What is 3a - 5a?
| -2a2 | |
| 15a | |
| 8a2 | |
| -2a |
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.
3a - 5a = -2a
A right angle measures:
90° |
|
360° |
|
180° |
|
45° |
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 circumference of a circle with a diameter of 6?
| 6π | |
| 12π | |
| 11π | |
| 16π |
The formula for circumference is circle diameter x π:
c = πd
c = 6π
The dimensions of this cylinder are height (h) = 5 and radius (r) = 1. What is the surface area?
| 44π | |
| 54π | |
| 272π | |
| 12π |
The surface area of a cylinder is 2πr2 + 2πrh:
sa = 2πr2 + 2πrh
sa = 2π(12) + 2π(1 x 5)
sa = 2π(1) + 2π(5)
sa = (2 x 1)π + (2 x 5)π
sa = 2π + 10π
sa = 12π