Missing angles in isosceles and equilateral triangles
5th grade (Year 6 in England) · 16 questions · Common Core: 5.G.B.3 · England: Y6 Geometry
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Score/ 16
Question 1
In an isosceles triangle each base angle is 66°. What is the third angle?
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Question 2
Ethan says each angle in an equilateral triangle is 90°. Spot the mistake. What is each angle really?
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Question 3
An isosceles triangle has a top angle of 108°. The two base angles are equal. What is each base angle?
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Question 4
In an isosceles triangle each base angle is 61°. What is the third angle?
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Question 5
Kwame says each angle in an equilateral triangle is 90°. Spot the mistake. What is each angle really?
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Question 6
An isosceles triangle has a top angle of 104°. The two base angles are equal. What is each base angle?
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Question 7
In an isosceles triangle each base angle is 72°. What is the third angle?
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Question 8
Chloe says each angle in an equilateral triangle is 90°. Spot the mistake. What is each angle really?
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Question 9
An isosceles triangle has a top angle of 120°. The two base angles are equal. What is each base angle?
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Question 10
In an isosceles triangle each base angle is 36°. What is the third angle?
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Question 11
Zara says each angle in an equilateral triangle is 90°. Spot the mistake. What is each angle really?
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Question 12
An isosceles triangle has a top angle of 26°. The two base angles are equal. What is each base angle?
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Question 13
In an isosceles triangle each base angle is 50°. What is the third angle?
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Question 14
Tariq says each angle in an equilateral triangle is 90°. Spot the mistake. What is each angle really?
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Question 15
An isosceles triangle has a top angle of 30°. The two base angles are equal. What is each base angle?
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Question 16
In an isosceles triangle each base angle is 27°. What is the third angle?
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