Year 10 maths · A.3 · Triangles
Find x from the angles of a triangle
The three angles add to 180°.
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The angles of a triangle are x°, (3x + 2)° and (3x + 10)°. Find x.
Answer: 24
The angles of a triangle are x°, (2x − 9)° and (2x + 44)°. Find x.
Answer: 29
The angles of a triangle are x°, (2x + 16)° and (2x + 34)°. Find x.
Answer: 26
Tip: The three angles add to 180°.
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