Across
- 5. The total length of the boundary of a closed figure
- 6. A polygon with three sides.
- 7. The amount of surface enclosed within a boundary.
Down
- 1. The longest side of a right-angled triangle.
- 2. A triangle with all three sides of different lengths.
- 3. A triangle with two equal sides.
- 4. A triangle with all sides equal.