| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.21 |
| Score | 0% | 64% |
The formula for the area of a circle is which of the following?
a = π d |
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a = π r |
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a = π r2 |
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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 = 15cm, side y = 12cm, and side z = 13cm what is the perimeter of this triangle?
| 40cm | |
| 31cm | |
| 29cm | |
| 30cm |
The perimeter of a triangle is the sum of the lengths of its sides:
p = x + y + z
p = 15cm + 12cm + 13cm = 40cm
Order the following types of angle from least number of degrees to most number of degrees.
right, obtuse, acute |
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acute, obtuse, right |
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right, acute, obtuse |
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acute, right, obtuse |
An acute angle measures less than 90°, a right angle measures 90°, and an obtuse angle measures more than 90°.
A(n) __________ is to a parallelogram as a square is to a rectangle.
quadrilateral |
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rhombus |
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triangle |
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trapezoid |
A rhombus is a parallelogram with four equal-length sides. A square is a rectangle with four equal-length sides.
Solve 4b - 8b = 5b + x + 9 for b in terms of x.
| -2\(\frac{3}{4}\)x + 2 | |
| -15x + 8 | |
| -9x - 9 | |
| 5\(\frac{1}{2}\)x - 4 |
To solve this equation, isolate the variable for which you are solving (b) on one side of the equation and put everything else on the other side.
4b - 8x = 5b + x + 9
4b = 5b + x + 9 + 8x
4b - 5b = x + 9 + 8x
-b = 9x + 9
b = \( \frac{9x + 9}{-1} \)
b = \( \frac{9x}{-1} \) + \( \frac{9}{-1} \)
b = -9x - 9