| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.12 |
| Score | 0% | 62% |
Which of the following statements about a parallelogram is not true?
a parallelogram is a quadrilateral |
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opposite sides and adjacent angles are equal |
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the perimeter of a parallelogram is the sum of the lengths of all sides |
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the area of a parallelogram is base x height |
A parallelogram is a quadrilateral with two sets of parallel sides. Opposite sides (a = c, b = d) and angles (red = red, blue = blue) are equal. The area of a parallelogram is base x height and the perimeter is the sum of the lengths of all sides (a + b + c + d).
Solve for a:
9a + 9 > \( \frac{a}{9} \)
| a > \(\frac{12}{17}\) | |
| a > -1\(\frac{7}{11}\) | |
| a > -\(\frac{7}{36}\) | |
| a > -1\(\frac{1}{80}\) |
To solve this equation, repeatedly do the same thing to both sides of the equation until the variable is isolated on one side of the > sign and the answer on the other.
9a + 9 > \( \frac{a}{9} \)
9 x (9a + 9) > a
(9 x 9a) + (9 x 9) > a
81a + 81 > a
81a + 81 - a > 0
81a - a > -81
80a > -81
a > \( \frac{-81}{80} \)
a > -1\(\frac{1}{80}\)
A(n) __________ is to a parallelogram as a square is to a rectangle.
triangle |
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rhombus |
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quadrilateral |
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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.
If a = c = 7, b = d = 2, what is the area of this rectangle?
| 14 | |
| 9 | |
| 42 | |
| 12 |
The area of a rectangle is equal to its length x width:
a = l x w
a = a x b
a = 7 x 2
a = 14
A right angle measures:
360° |
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180° |
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90° |
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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.