| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.23 |
| Score | 0% | 65% |
What is the area of a circle with a radius of 2?
| 5π | |
| 36π | |
| 16π | |
| 4π |
The formula for area is πr2:
a = πr2
a = π(22)
a = 4π
If side x = 12cm, side y = 13cm, and side z = 15cm what is the perimeter of this triangle?
| 20cm | |
| 31cm | |
| 22cm | |
| 40cm |
The perimeter of a triangle is the sum of the lengths of its sides:
p = x + y + z
p = 12cm + 13cm + 15cm = 40cm
A cylinder with a radius (r) and a height (h) has a surface area of:
π r2h |
|
2(π r2) + 2π rh |
|
π r2h2 |
|
4π r2 |
A cylinder is a solid figure with straight parallel sides and a circular or oval cross section with a radius (r) and a height (h). The volume of a cylinder is π r2h and the surface area is 2(π r2) + 2π rh.
If angle a = 31° and angle b = 55° what is the length of angle c?
| 51° | |
| 86° | |
| 94° | |
| 115° |
The sum of the interior angles of a triangle is 180°:
180° = a° + b° + c°
c° = 180° - a° - b°
c° = 180° - 31° - 55° = 94°
The dimensions of this cylinder are height (h) = 6 and radius (r) = 9. What is the surface area?
| 100π | |
| 270π | |
| 224π | |
| 30π |
The surface area of a cylinder is 2πr2 + 2πrh:
sa = 2πr2 + 2πrh
sa = 2π(92) + 2π(9 x 6)
sa = 2π(81) + 2π(54)
sa = (2 x 81)π + (2 x 54)π
sa = 162π + 108π
sa = 270π