How it works
A shape is its corners joined in order. A side is the gap between its numbers.
If two corners share the same first number, the side is straight up and down; the length is the gap between the second numbers.
Add all the sides to find the way round.
Worked examples
A side
- B is at (7, 1) and C is at (7, 6).
- They share 7 across, so the side is vertical.
- Its length is 6 − 1 = 5.
Round the rectangle
- Corners (8, 1), (1, 1), (1, 6) and (8, 6).
- Lengths are 7 and 5.
- Perimeter: 7 + 5 + 7 + 5 = 24.
Draw it
- Plot A, B, C, D, E in order and join them.
- Join the last back to the first.
- The shape closes.
A taste of the worksheet
These are the first problems of set A. The printable sheet has many more, with an answer key.
- The corners A, B, C and D make a rectangle. How long is side AB? Answer: ___
- This triangle has corners A, B and C. How long is side AC? Answer: ___
- How far is it all the way round the rectangle ABCD? Answer: ___
- Which list gives the corners A, B, C and D of this rectangle, in order?