| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.99 |
| Score | 0% | 60% |
If angle a = 60° and angle b = 48° what is the length of angle c?
| 72° | |
| 102° | |
| 76° | |
| 127° |
The sum of the interior angles of a triangle is 180°:
180° = a° + b° + c°
c° = 180° - a° - b°
c° = 180° - 60° - 48° = 72°
A cylinder with a radius (r) and a height (h) has a surface area of:
π r2h |
|
4π r2 |
|
2(π r2) + 2π rh |
|
π r2h2 |
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.
Solve for z:
z2 + 16z + 63 = 0
| 3 or -7 | |
| 5 or -3 | |
| 9 or -5 | |
| -7 or -9 |
The first step to solve a quadratic equation that's set to zero is to factor the quadratic equation:
z2 + 16z + 63 = 0
(z + 7)(z + 9) = 0
For this expression to be true, the left side of the expression must equal zero. Therefore, either (z + 7) or (z + 9) must equal zero:
If (z + 7) = 0, z must equal -7
If (z + 9) = 0, z must equal -9
So the solution is that z = -7 or -9
On this circle, a line segment connecting point A to point D is called:
radius |
|
diameter |
|
chord |
|
circumference |
A circle is a figure in which each point around its perimeter is an equal distance from the center. The radius of a circle is the distance between the center and any point along its perimeter. A chord is a line segment that connects any two points along its perimeter. The diameter of a circle is the length of a chord that passes through the center of the circle and equals twice the circle's radius (2r).
What is the circumference of a circle with a diameter of 16?
| 13π | |
| 2π | |
| 19π | |
| 16π |
The formula for circumference is circle diameter x π:
c = πd
c = 16π