| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 4.03 |
| Score | 0% | 81% |
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 a = c = 2, b = d = 8, what is the area of this rectangle?
| 2 | |
| 16 | |
| 25 | |
| 14 |
The area of a rectangle is equal to its length x width:
a = l x w
a = a x b
a = 2 x 8
a = 16
If a = -3 and z = 2, what is the value of 2a(a - z)?
| 720 | |
| -270 | |
| 30 | |
| 756 |
To solve this equation, replace the variables with the values given and then solve the now variable-free equation. (Remember order of operations, PEMDAS, Parentheses, Exponents, Multiplication/Division, Addition/Subtraction.)
2a(a - z)
2(-3)(-3 - 2)
2(-3)(-5)
(-6)(-5)
30
A quadrilateral is a shape with __________ sides.
4 |
|
5 |
|
2 |
|
3 |
A quadrilateral is a shape with four sides. The perimeter of a quadrilateral is the sum of the lengths of its four sides.
If a = 3, b = 5, c = 9, and d = 2, what is the perimeter of this quadrilateral?
| 18 | |
| 19 | |
| 17 | |
| 16 |
Perimeter is equal to the sum of the four sides:
p = a + b + c + d
p = 3 + 5 + 9 + 2
p = 19