Geometry and measuresKS3 / GCSE

Perimeter of a compound rectilinear shape

Find missing lengths before adding the outside edges.

  • Use subtraction to find any missing horizontal or vertical lengths.
  • Trace the whole outside boundary, including the inward corner.
  • Do not count an internal dividing line.

Example 1

Find the perimeter of the L-shape.

Find the missing horizontal length.Find the missing vertical length.
Find the missing horizontal length.Find the missing vertical length.

Example 2

Find the perimeter of the L-shape.

Find the missing horizontal length.Find the missing vertical length.
Find the missing horizontal length.Find the missing vertical length.

Your turn

Question 1

Find the perimeter of the L-shape.

Check answer
Find the missing horizontal length.Find the missing vertical length.
Find the missing horizontal length.Find the missing vertical length.
Question 2

Find the perimeter of the L-shape.

Check answer
Find the missing horizontal length.Find the missing vertical length.
Find the missing horizontal length.Find the missing vertical length.
Question 3

Find the perimeter of the L-shape.

Check answer
Find the missing horizontal length.Find the missing vertical length.
Find the missing horizontal length.Find the missing vertical length.
Question 4

Find the perimeter of the L-shape.

Check answer
Find the missing horizontal length.Find the missing vertical length.
Find the missing horizontal length.Find the missing vertical length.
Question 5

Find the perimeter of the L-shape.

Check answer
Find the missing horizontal length.Find the missing vertical length.
Find the missing horizontal length.Find the missing vertical length.
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