Worked examples
Two examples
Example 1
Which formula gives the volume of a cylinder?
- A cylinder is a stack of circles: the circle’s area times the height.
Answer: V = πr2h
Example 2
Which formula gives the area of a trapezoid?
- Average the two parallel sides, then multiply by the height.
Answer: A = 12h(b1 + b2)
Where this is taught: Quiz 27: Perimeter and Area, “The formulas on the GED sheet”
The drill
Ten problems
How many:
Tap your answer to each one, then press Check my answers at the bottom.Circle your answer to each one. The answer key, with the reasoning, is on the last page.