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Year 8 maths · S.9 · Angles and triangles

Write and solve equations: complementary angles

Write an equation that adds the two angles and sets it equal to the total, then solve for x.

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See worked examples
  1. Two complementary angles measure (2x)° and (3x + 45)°. Find x.

    Answer: 9

  2. Two complementary angles measure (4x + 6)° and (3x + 35)°. Find x.

    Answer: 7

  3. Two complementary angles measure (3x)° and (3x + 42)°. Find x.

    Answer: 8

Tip: Write an equation that adds the two angles and sets it equal to the total, then solve for x.

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