Worked examples
Two examples
Example 1
A triangle has a base of 10 cm and a height of 6 cm. What is its area?
- A triangle is half a rectangle: 12 × 10 × 6.
Answer: 30 square cm
Example 2
A triangle has a base of 7 ft and a height of 5 ft. What is its area?
- 12 × 7 × 5 = 17.5.
Answer: 17.5 square feet
Where this is taught: Quiz 27: Perimeter and Area, “Half a rectangle”
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.