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 138°. The other two angles are equal. What is each of them?
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Question 2
In a triangle, two angles are 61° and 62°. 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 6x. What is the largest angle, in degrees?
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Question 4
An isosceles triangle has two equal base angles of 43°. What is the third angle?
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Question 5
In a triangle, two angles are 66° and 57°. 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 124°. The other two angles are equal. What is each of them?
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Question 8
In a triangle, two angles are 63° and 61°. 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 x, x and 2x. What is the largest angle, in degrees?
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Question 10
An isosceles triangle has two equal base angles of 21°. What is the third angle?
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Question 11
In a triangle, two angles are 36° and 111°. 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 x, 2x and 6x. What is the largest angle, in degrees?
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Question 13
An isosceles triangle has a top angle of 26°. The other two angles are equal. What is each of them?
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Question 14
In a triangle, two angles are 26° and 53°. 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 x, x and 2x. What is the largest angle, in degrees?
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Question 16
An isosceles triangle has a top angle of 44°. The other two angles are equal. What is each of them?
Answer
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