| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.13 |
| Score | 0% | 63% |
The formula for the area of a circle is which of the following?
a = π d |
|
a = π d2 |
|
a = π r |
|
a = 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.
What is the area of a circle with a diameter of 6?
| 9π | |
| 4π | |
| 6π | |
| 64π |
The formula for area is πr2. Radius is circle \( \frac{diameter}{2} \):
r = \( \frac{d}{2} \)
r = \( \frac{6}{2} \)
r = 3
a = πr2
a = π(32)
a = 9π
A(n) __________ is to a parallelogram as a square is to a rectangle.
triangle |
|
trapezoid |
|
quadrilateral |
|
rhombus |
A rhombus is a parallelogram with four equal-length sides. A square is a rectangle with four equal-length sides.
The dimensions of this trapezoid are a = 4, b = 7, c = 5, d = 5, and h = 3. What is the area?
| 32 | |
| 27\(\frac{1}{2}\) | |
| 16 | |
| 18 |
The area of a trapezoid is one-half the sum of the lengths of the parallel sides multiplied by the height:
a = ½(b + d)(h)
a = ½(7 + 5)(3)
a = ½(12)(3)
a = ½(36) = \( \frac{36}{2} \)
a = 18
The dimensions of this cylinder are height (h) = 1 and radius (r) = 3. What is the volume?
| 72π | |
| 24π | |
| 9π | |
| 5π |
The volume of a cylinder is πr2h:
v = πr2h
v = π(32 x 1)
v = 9π