Geometry and measuresKey Stage 3

Area of a triangle

Use half the base times the perpendicular height.

  • Use .
  • The height must be perpendicular to the chosen base.
  • Give area in square units.

Example 1

Find the area of the triangle.

Use the perpendicular height.

Example 2

Find the area of the triangle.

Use the perpendicular height.

Your turn

Question 1

Find the area of the triangle.

Check answer
Use the perpendicular height.
Question 2

Find the area of the triangle.

Check answer
Use the perpendicular height.
Question 3

Find the area of the triangle.

Check answer
Use the perpendicular height.
Question 4

Find the area of the triangle.

Check answer
Use the perpendicular height.
Question 5

Find the area of the triangle.

Check answer
Use the perpendicular height.
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