Geometry and measuresGCSE / IGCSE

Angles in an equilateral triangle with algebra

Set an angle expression equal to 60° and solve.

  • Every interior angle is .
  • Set the given expression equal to , then solve for .

Example 1

Find in the equilateral triangle.

Every angle in an equilateral triangle is 60°.Apply this to both sides.Apply this to both sides.

Example 2

Find in the equilateral triangle.

Every angle in an equilateral triangle is 60°.Apply this to both sides.Apply this to both sides.

Your turn

Question 1

Find in the equilateral triangle.

Check answer
Every angle in an equilateral triangle is 60°.Apply this to both sides.Apply this to both sides.
Question 2

Find in the equilateral triangle.

Check answer
Every angle in an equilateral triangle is 60°.Apply this to both sides.Apply this to both sides.
Question 3

Find in the equilateral triangle.

Check answer
Every angle in an equilateral triangle is 60°.Apply this to both sides.Apply this to both sides.
Question 4

Find in the equilateral triangle.

Check answer
Every angle in an equilateral triangle is 60°.Apply this to both sides.Apply this to both sides.
Question 5

Find in the equilateral triangle.

Check answer
Every angle in an equilateral triangle is 60°.Apply this to both sides.Apply this to both sides.
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