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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Question 1
In an isosceles triangle each base angle is 72°. What is the third angle?
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Question 2
Amara 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 126°. 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 38°. What is the third angle?
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Question 5
Daniel 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 74°. 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 42°. What is the third angle?
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Question 8
Arjun 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 20°. 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 25°. What is the third angle?
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Question 11
Ava 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 68°. 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 32°. What is the third angle?
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Question 14
Fatima 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 128°. 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 58°. What is the third angle?
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