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Build a right-angled triangle from paper pieces

The question

Work in groups. Cut out some of the shapes on the cut-out sheet and fit them together to make one right-angled triangle. Colour the right-angled triangle so that 1/3 of it is orange and 2/3 of it is purple. Then work out the area of the triangle.

Try it first, then show the answer

Answer

  • area:162 cm²
  • orange:54 cm²
  • purple:108 cm²
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