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The area of a triangle

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Half a rectangle

A triangle fills half its rectanglesurrounding rectangleheightbaseA = ½ × b × hthe half comes from the picturebase 8, height 6½ × 8 × 6 = 24 cm²height must be PERPENDICULARThe two red corners fold in to fill the blue exactly.
Half of base × height — every time.
  1. 1Draw the rectangle that fits round a triangle.