Properties of Triangles (Junior Cert Mathematics): Quizzes

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Properties of Triangles
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What do the three interior angles of a triangle always add up to?

180°180°

A triangle has angles of 50°50° and 60°60°. What is the third angle?

70°70°

How is an exterior angle of a triangle formed?

By extending one side of the triangle

An exterior angle of a triangle equals what?

Sum of two opposite interior angles

If two opposite interior angles are 40°40° and 70°70°, what is the exterior angle?

110°110°

In a triangle with angles 35°35° and 45°45°, what is the missing angle?

100°100°

If two opposite interior angles are 55°55° and 65°65°, find the exterior angle.

120°120°

A triangle has angles 30°30° and 90°90°. What is the third angle?

60°60°

Why are triangle angle properties useful in exams?

Find missing angles without protractor

If you know two interior angles, which rule finds the third?

Interior angles sum to 180°180°

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