| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.84 |
| Score | 0% | 57% |
Which of the following statements about a triangle is not true?
exterior angle = sum of two adjacent interior angles |
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perimeter = sum of side lengths |
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area = ½bh |
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sum of interior angles = 180° |
A triangle is a three-sided polygon. It has three interior angles that add up to 180° (a + b + c = 180°). An exterior angle of a triangle is equal to the sum of the two interior angles that are opposite (d = b + c). The perimeter of a triangle is equal to the sum of the lengths of its three sides, the height of a triangle is equal to the length from the base to the opposite vertex (angle) and the area equals one-half triangle base x height: a = ½ base x height.
If the base of this triangle is 2 and the height is 2, what is the area?
| 30 | |
| 2 | |
| 24 | |
| 33 |
The area of a triangle is equal to ½ base x height:
a = ½bh
a = ½ x 2 x 2 = \( \frac{4}{2} \) = 2
The formula for the area of a circle is which of the following?
c = π d2 |
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c = π r |
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c = π d |
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c = π r2 |
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 b = 6 and z = 4, what is the value of 6b(b - z)?
| 25 | |
| -144 | |
| -7 | |
| 72 |
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.)
6b(b - z)
6(6)(6 - 4)
6(6)(2)
(36)(2)
72
The formula for the area of a circle is which of the following?
a = π r2 |
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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.