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Year 8 maths · S.6 · Angles and triangles

Acute angles in a right triangle

A right triangle has one right angle, so the other two angles add to 90 degrees.

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  1. A right triangle has one acute angle of 43°. How many degrees is the other acute angle?

    Answer: 47

  2. A right triangle has one acute angle of 71°. How many degrees is the other acute angle?

    Answer: 19

  3. A right triangle has one acute angle of 14°. How many degrees is the other acute angle?

    Answer: 76

Tip: A right triangle has one right angle, so the other two angles add to 90 degrees.

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