| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.45 |
| Score | 0% | 69% |
The formula for the area of a circle is which of the following?
a = π r2 |
|
a = π r |
|
a = π d |
|
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 angle a = 38° and angle b = 48° what is the length of angle c?
| 86° | |
| 69° | |
| 94° | |
| 65° |
The sum of the interior angles of a triangle is 180°:
180° = a° + b° + c°
c° = 180° - a° - b°
c° = 180° - 38° - 48° = 94°
The dimensions of this cube are height (h) = 5, length (l) = 6, and width (w) = 5. What is the volume?
| 150 | |
| 21 | |
| 96 | |
| 36 |
The volume of a cube is height x length x width:
v = h x l x w
v = 5 x 6 x 5
v = 150
A trapezoid is a quadrilateral with one set of __________ sides.
right angle |
|
equal length |
|
equal angle |
|
parallel |
A trapezoid is a quadrilateral with one set of parallel sides.
Find the value of a:
9a + y = 2
-5a - y = 8
| 2\(\frac{1}{2}\) | |
| \(\frac{7}{17}\) | |
| -\(\frac{12}{29}\) | |
| \(\frac{3}{4}\) |
You need to find the value of a so solve the first equation in terms of y:
9a + y = 2
y = 2 - 9a
then substitute the result (2 - 9a) into the second equation:
-5a - 1(2 - 9a) = 8
-5a + (-1 x 2) + (-1 x -9a) = 8
-5a - 2 + 9a = 8
-5a + 9a = 8 + 2
4a = 10
a = \( \frac{10}{4} \)
a = 2\(\frac{1}{2}\)