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Lines, Triangles and Circles · Question 16 of 67

Question 16

EasyOriginal question

In an isosceles triangle, the angle between the two equal sides is 40°. What is each of the other two angles?

Options for question 16

Show the answer and explanation
CorrectNot quiteAnswer D

Correct answer: D

Explanation

  1. The two base angles are equal and add up to 180∘−40∘=140∘180^\circ - 40^\circ = 140^\circ.

  2. Each base angle = 140∘÷2=70∘140^\circ \div 2 = 70^\circ.

Worth noting

50° comes from sharing 90∘−40∘90^\circ - 40^\circ instead of 180∘−40∘180^\circ - 40^\circ. 20° is just half the given angle.

Concept
Base angles of an isosceles triangle
Typical time
40 s
Your time
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