| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.79 |
| Score | 0% | 76% |
The formula for the area of a circle is which of the following?
a = π r2 |
|
a = π d2 |
|
a = π r |
|
a = π d |
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.
A right angle measures:
180° |
|
90° |
|
45° |
|
360° |
A right angle measures 90 degrees and is the intersection of two perpendicular lines. In diagrams, a right angle is indicated by a small box completing a square with the perpendicular lines.
If BD = 11 and AD = 17, AB = ?
| 6 | |
| 3 | |
| 13 | |
| 8 |
The entire length of this line is represented by AD which is AB + BD:
AD = AB + BD
Solving for AB:AB = AD - BDIf b = -3 and x = 3, what is the value of 4b(b - x)?
| 72 | |
| 84 | |
| -135 | |
| 108 |
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.)
4b(b - x)
4(-3)(-3 - 3)
4(-3)(-6)
(-12)(-6)
72
If side a = 7, side b = 7, what is the length of the hypotenuse of this right triangle?
| \( \sqrt{98} \) | |
| \( \sqrt{58} \) | |
| \( \sqrt{65} \) | |
| \( \sqrt{26} \) |
According to the Pythagorean theorem, the hypotenuse squared is equal to the sum of the two perpendicular sides squared:
c2 = a2 + b2
c2 = 72 + 72
c2 = 49 + 49
c2 = 98
c = \( \sqrt{98} \)