| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 4.05 |
| Score | 0% | 81% |
A(n) __________ is two expressions separated by an equal sign.
expression |
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equation |
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formula |
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problem |
An equation is two expressions separated by an equal sign. The key to solving equations is to repeatedly do the same thing to both sides of the equation until the variable is isolated on one side of the equal sign and the answer on the other.
If a = c = 9, b = d = 8, what is the area of this rectangle?
| 21 | |
| 72 | |
| 28 | |
| 81 |
The area of a rectangle is equal to its length x width:
a = l x w
a = a x b
a = 9 x 8
a = 72
A right angle measures:
90° |
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360° |
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180° |
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45° |
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.
The formula for the area of a circle is which of the following?
a = π d |
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a = π d2 |
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a = π r2 |
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a = π r |
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 = 9cm, side y = 7cm, and side z = 14cm what is the perimeter of this triangle?
| 30cm | |
| 22cm | |
| 32cm | |
| 28cm |
The perimeter of a triangle is the sum of the lengths of its sides:
p = x + y + z
p = 9cm + 7cm + 14cm = 30cm