| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.30 |
| Score | 0% | 66% |
The formula for the area of a circle is which of the following?
a = π r2 |
|
a = π d |
|
a = π r |
|
a = π d2 |
The circumference of a circle is the distance around its perimeter and equals π (approx. 3.14159) x diameter: c = π d. The area of a circle is π x (radius)2 : a = π r2.
If side x = 5cm, side y = 15cm, and side z = 8cm what is the perimeter of this triangle?
| 38cm | |
| 28cm | |
| 37cm | |
| 39cm |
The perimeter of a triangle is the sum of the lengths of its sides:
p = x + y + z
p = 5cm + 15cm + 8cm = 28cm
The dimensions of this cylinder are height (h) = 4 and radius (r) = 1. What is the volume?
| 392π | |
| 128π | |
| 20π | |
| 4π |
The volume of a cylinder is πr2h:
v = πr2h
v = π(12 x 4)
v = 4π
Solve for c:
-9c - 5 > 3 - 2c
| c > -4 | |
| c > -1\(\frac{1}{7}\) | |
| c > -1 | |
| c > 1 |
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.
-9c - 5 > 3 - 2c
-9c > 3 - 2c + 5
-9c + 2c > 3 + 5
-7c > 8
c > \( \frac{8}{-7} \)
c > -1\(\frac{1}{7}\)
The dimensions of this cylinder are height (h) = 2 and radius (r) = 4. What is the surface area?
| 140π | |
| 48π | |
| 272π | |
| 36π |
The surface area of a cylinder is 2πr2 + 2πrh:
sa = 2πr2 + 2πrh
sa = 2π(42) + 2π(4 x 2)
sa = 2π(16) + 2π(8)
sa = (2 x 16)π + (2 x 8)π
sa = 32π + 16π
sa = 48π