Classify triangles; angles in a triangle
5th grade (Year 6 in England) · 16 questions · Common Core: 5.G.B.3, 5.G.B.4, 8.G.A.5 · England: Y5 Geometry, Y6 Geometry
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Question 1
Two angles of a triangle are 74° and 74°. What is the third angle, in degrees?
Answer
Question 2
A triangle has one angle of 90°. What type of triangle is it?
- A. equilateral
- B. isosceles
- C. right-angled
- D. scalene
Question 3
An isosceles triangle has two equal base angles of 71° each. What is the third angle, in degrees?
Answer
Question 4
Two angles of a triangle are 57° and 24°. What is the third angle, in degrees?
Answer
Question 5
A triangle has one angle of 90°. What type of triangle is it?
- A. scalene
- B. equilateral
- C. isosceles
- D. right-angled
Question 6
An isosceles triangle has two equal base angles of 75° each. What is the third angle, in degrees?
Answer
Question 7
Two angles of a triangle are 64° and 63°. What is the third angle, in degrees?
Answer
Question 8
A triangle has all three sides equal. What type of triangle is it?
- A. scalene
- B. equilateral
- C. right-angled
- D. isosceles
Question 9
An isosceles triangle has two equal base angles of 63° each. What is the third angle, in degrees?
Answer
Question 10
Two angles of a triangle are 91° and 25°. What is the third angle, in degrees?
Answer
Question 11
A triangle has one angle of 90°. What type of triangle is it?
- A. scalene
- B. equilateral
- C. isosceles
- D. right-angled
Question 12
An isosceles triangle has a top angle of 70°. The two base angles are equal. What is one base angle, in degrees?
Answer
Question 13
Two angles of a triangle are 20° and 123°. What is the third angle, in degrees?
Answer
Question 14
A triangle has no equal sides. What type of triangle is it?
- A. equilateral
- B. scalene
- C. isosceles
- D. right-angled
Question 15
An isosceles triangle has a top angle of 18°. The two base angles are equal. What is one base angle, in degrees?
Answer
Question 16
Two angles of a triangle are 50° and 60°. What is the third angle, in degrees?
Answer
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