| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.93 |
| Score | 0% | 59% |
A quadrilateral is a shape with __________ sides.
4 |
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3 |
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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.
The formula for the area of a circle is which of the following?
a = π r |
|
a = π d |
|
a = π r2 |
|
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.
The dimensions of this cylinder are height (h) = 8 and radius (r) = 6. What is the surface area?
| 30π | |
| 40π | |
| 168π | |
| 180π |
The surface area of a cylinder is 2πr2 + 2πrh:
sa = 2πr2 + 2πrh
sa = 2π(62) + 2π(6 x 8)
sa = 2π(36) + 2π(48)
sa = (2 x 36)π + (2 x 48)π
sa = 72π + 96π
sa = 168π
The formula for the area of a circle is which of the following?
c = π r |
|
c = π d2 |
|
c = π r2 |
|
c = π d |
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.
Solve for c:
-7c + 6 > -7 + 8c
| c > -1 | |
| c > -\(\frac{5}{9}\) | |
| c > \(\frac{13}{15}\) | |
| c > \(\frac{6}{7}\) |
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.
-7c + 6 > -7 + 8c
-7c > -7 + 8c - 6
-7c - 8c > -7 - 6
-15c > -13
c > \( \frac{-13}{-15} \)
c > \(\frac{13}{15}\)