| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.72 |
| Score | 0% | 74% |
A quadrilateral is a shape with __________ sides.
3 |
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5 |
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4 |
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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 angle a = 56° and angle b = 37° what is the length of angle c?
| 84° | |
| 74° | |
| 80° | |
| 87° |
The sum of the interior angles of a triangle is 180°:
180° = a° + b° + c°
c° = 180° - a° - b°
c° = 180° - 56° - 37° = 87°
What is the circumference of a circle with a radius of 2?
| 19π | |
| 36π | |
| 4π | |
| 16π |
The formula for circumference is circle diameter x π. Circle diameter is 2 x radius:
c = πd
c = π(2 * r)
c = π(2 * 2)
c = 4π
If angle a = 29° and angle b = 47° what is the length of angle d?
| 151° | |
| 128° | |
| 113° | |
| 145° |
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° - 29° - 47° = 104°
So, d° = 47° + 104° = 151°
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° - 29° = 151°
If side x = 14cm, side y = 12cm, and side z = 13cm what is the perimeter of this triangle?
| 30cm | |
| 28cm | |
| 39cm | |
| 32cm |
The perimeter of a triangle is the sum of the lengths of its sides:
p = x + y + z
p = 14cm + 12cm + 13cm = 39cm