AI generatedGeometry and measuresGCSE Higher

Area of a triangle using one half

Area of a triangle using one half .

  • Label the sides and angles before choosing a rule.
  • Sine rule: matching opposite pairs. Cosine rule: three sides or two sides and the included angle.
  • Use degree mode. Keep full calculator accuracy until the final rounding step.

Example 1

Find the exact area of triangle ABC.

Triangle ABC; lengths in cmABCDiagram not to scale
A must be the included angle.Substitute the two sides and included angle.

Example 2

Find the exact area of triangle ABC.

Triangle ABC; lengths in cmABCDiagram not to scale
A must be the included angle.Substitute the two sides and included angle.

Your turn

Question 1

Find the exact area of triangle ABC.

Triangle ABC; lengths in cmABCDiagram not to scale
Check answer
A must be the included angle.Substitute the two sides and included angle.
Question 2

Find the exact area of triangle ABC.

Triangle ABC; lengths in cmABCDiagram not to scale
Check answer
A must be the included angle.Substitute the two sides and included angle.
Question 3

Find the exact area of triangle ABC.

Triangle ABC; lengths in cmABCDiagram not to scale
Check answer
A must be the included angle.Substitute the two sides and included angle.
Question 4

Find the exact area of triangle ABC.

Triangle ABC; lengths in cmABCDiagram not to scale
Check answer
A must be the included angle.Substitute the two sides and included angle.
Question 5

Find the exact area of triangle ABC.

Triangle ABC; lengths in cmABCDiagram not to scale
Check answer
A must be the included angle.Substitute the two sides and included angle.
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