| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 4.00 |
| Score | 0% | 80% |
If angle a = 58° and angle b = 33° what is the length of angle d?
| 128° | |
| 131° | |
| 122° | |
| 121° |
An exterior angle of a triangle is equal to the sum of the two interior angles that are opposite:
d° = b° + c°
To find angle c, remember that the sum of the interior angles of a triangle is 180°:
180° = a° + b° + c°
c° = 180° - a° - b°
c° = 180° - 58° - 33° = 89°
So, d° = 33° + 89° = 122°
A shortcut to get this answer is to remember that angles around a line add up to 180°:
a° + d° = 180°
d° = 180° - a°
d° = 180° - 58° = 122°
A right angle measures:
90° |
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360° |
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45° |
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180° |
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.
A(n) __________ is two expressions separated by an equal sign.
formula |
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equation |
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problem |
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expression |
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.
A quadrilateral is a shape with __________ sides.
3 |
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4 |
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5 |
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2 |
A quadrilateral is a shape with four sides. The perimeter of a quadrilateral is the sum of the lengths of its four sides.
If a = 2, b = 4, c = 7, and d = 4, what is the perimeter of this quadrilateral?
| 17 | |
| 26 | |
| 29 | |
| 21 |
Perimeter is equal to the sum of the four sides:
p = a + b + c + d
p = 2 + 4 + 7 + 4
p = 17