Shape and Space 4
2 marks · EasyA triangle has sides of length 3 cm, 4 cm, and 5 cm. Work out the area of the triangle.
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6 cm^2 (±0.1)
Also accept: 6.0 cm^2
Common mistakes: 12 cm^2 (used the wrong base/height)
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Marking points
M1 · 1 mark · Identifies that the triangle is right-angled (3-4-5 triangle), uses area = 1/2 × base × height.
A1 · 1 mark · Area = 1/2 × 3 × 4 = 6 cm² (follow-through)
Worked solution
Triangle with sides 3, 4, 5 is right-angled (since ).
Area = cm²