Perimeter & Area
Fences, tiles, and drawing shapes on a grid.
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For an odd shape, cut it into rectangles, then add their areas.
Look: An L-shaped room. The dashed line cuts it into a 4 × 8 piece and a 6 × 3 piece.
✏️ Your turn!
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1A 12 × 8 m garden has a 4 × 3 m pond. Grass area?
2Join a 5 × 2 and a 3 × 2 rectangle. Total area?
3Perimeter of the L-shaped room?
! Careful!
✗Counting the dashed cut line in the perimeter.
✓Perimeter is only the outside edge.
✗Using 10 m for the bottom piece.
✓Part of the 10 m is already used: 10 − 4 = 6 m.
See the whole lesson on one page
For an odd shape, cut it into rectangles, then add their areas.
Find the area of each rectangle and add them. For the perimeter, walk all the way round the outside edge.
Think of it like thisAn L-shaped room is just two rectangles stuck together. Cut it with a line and do each one.
Solved together
Find the area of the L-shaped room in the picture.
Tall piece: 4 m wide, 8 m high.
4 × 8 = 32 m²Bottom piece: the rest of the 10 m, so 6 m wide, 3 m high.
6 × 3 = 18 m²Add the two pieces.
32 + 18 = 50 m²
AnswerThe area is 50 m².
Now practise it
Kanakku makes new questions on perimeter & area every time. It shows the working and gives a hint when you are stuck.