Worked examples
Two examples
Example 1
A rectangle is 12 feet long and 7 feet wide. What is its perimeter?
- Two lengths and two widths: 2 × 12 + 2 × 7 = 24 + 14.
Answer: 38 feet
Example 2
A regular hexagon has sides of 5 cm. What is its perimeter?
- Six equal sides: 6 × 5.
Answer: 30 cm
Where this is taught: Quiz 27: Perimeter and Area, “Perimeter: the walk around”
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.