Worked examples
Two examples
Example 1
A parallelogram has a base of 9 ft and a height of 4 ft. What is its area?
- Base × height (the straight-up height, not the slanted side): 9 × 4.
Answer: 36 square feet
Example 2
A trapezoid has parallel sides of 6 m and 10 m and a height of 4 m. What is its area?
- 12 × (6 + 10) × 4 = 12 × 16 × 4.
Answer: 32 square meters
Where this is taught: Quiz 37: Similar Figures, “The area of a trapezoid”
The drill
Ten problems
This drill also has challenge problems. They use the same skill, set up the way the GED test sometimes sets up a problem, so that it looks new at first.
How many:
Type each answer, then press Check my answers at the bottom. Commas in large numbers are fine.Write each answer on the line. The answer key, with the reasoning, is on the last page.