Missing angles in triangles, including isosceles and algebra
7th grade (Year 8 in England) · 16 questions · Common Core: 7.G.A.2, 8.G.A.5 · England: KS3 Geometry and measures, GCSE Foundation Geometry and measures
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Question 1
An isosceles triangle has a top angle of 126°. The other two angles are equal. What is each of them?
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Question 2
In a triangle, two angles are 36° and 96°. One side is extended to make an exterior angle next to the third angle. How big is that exterior angle?
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Question 3
The angles of a triangle are x, 2x and 3x. What is the largest angle, in degrees?
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Question 4
An isosceles triangle has two equal base angles of 48°. What is the third angle?
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Question 5
In a triangle, two angles are 29° and 83°. One side is extended to make an exterior angle next to the third angle. How big is that exterior angle?
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Question 6
The angles of a triangle are 3x, 4x and 5x. What is the largest angle, in degrees?
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Question 7
An isosceles triangle has a top angle of 60°. The other two angles are equal. What is each of them?
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Question 8
In a triangle, two angles are 58° and 71°. One side is extended to make an exterior angle next to the third angle. How big is that exterior angle?
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Question 9
The angles of a triangle are 2x, 2x and 5x. What is the largest angle, in degrees?
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Question 10
An isosceles triangle has a top angle of 126°. The other two angles are equal. What is each of them?
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Question 11
In a triangle, two angles are 66° and 35°. One side is extended to make an exterior angle next to the third angle. How big is that exterior angle?
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Question 12
The angles of a triangle are 2x, 2x and 5x. What is the largest angle, in degrees?
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Question 13
An isosceles triangle has two equal base angles of 46°. What is the third angle?
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Question 14
In a triangle, two angles are 78° and 37°. One side is extended to make an exterior angle next to the third angle. How big is that exterior angle?
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Question 15
The angles of a triangle are 2x, 3x and 4x. What is the largest angle, in degrees?
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Question 16
An isosceles triangle has two equal base angles of 66°. What is the third angle?
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