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Lines, Triangles and Circles · Question 17 of 67

Question 17

EasyOriginal question

Each of the two equal angles of an isosceles triangle measures 52°. What is the third angle?

Options for question 17

Show the answer and explanation
CorrectNot quiteAnswer C

Correct answer: C

Explanation

  1. The two equal angles total 2×52∘=104∘2 \times 52^\circ = 104^\circ.

  2. Third angle = 180∘−104∘=76∘180^\circ - 104^\circ = 76^\circ.

Worth noting

64° comes from wrongly treating 52° as the apex angle. 128° is 180∘−52∘180^\circ - 52^\circ, forgetting there are two equal angles.

Concept
Angle sum in an isosceles triangle
Typical time
40 s
Your time
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The rule this testsTriangles
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