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
Name
Date
Score/ 16
Question 1
A triangle has all three sides equal. What type of triangle is it?
- A. scalene
- B. isosceles
- C. right-angled
- D. equilateral
Question 2
An isosceles triangle has two equal base angles of 79° each. What is the third angle, in degrees?
Answer
Question 3
Two angles of a triangle are 25° and 117°. What is the third angle, in degrees?
Answer
Question 4
A triangle has one angle of 90°. What type of triangle is it?
- A. right-angled
- B. equilateral
- C. scalene
- D. isosceles
Question 5
An isosceles triangle has two equal base angles of 20° each. What is the third angle, in degrees?
Answer
Question 6
Two angles of a triangle are 87° and 63°. What is the third angle, in degrees?
Answer
Question 7
A triangle has no equal sides. What type of triangle is it?
- A. scalene
- B. right-angled
- C. equilateral
- D. isosceles
Question 8
An isosceles triangle has two equal base angles of 21° each. What is the third angle, in degrees?
Answer
Question 9
Two angles of a triangle are 25° and 23°. What is the third angle, in degrees?
Answer
Question 10
A triangle has all three sides equal. What type of triangle is it?
- A. scalene
- B. right-angled
- C. equilateral
- D. isosceles
Question 11
An isosceles triangle has two equal base angles of 51° each. What is the third angle, in degrees?
Answer
Question 12
Two angles of a triangle are 78° and 61°. What is the third angle, in degrees?
Answer
Question 13
A triangle has no equal sides. What type of triangle is it?
- A. equilateral
- B. scalene
- C. right-angled
- D. isosceles
Question 14
An isosceles triangle has two equal base angles of 81° each. What is the third angle, in degrees?
Answer
Question 15
Two angles of a triangle are 20° and 81°. What is the third angle, in degrees?
Answer
Question 16
A triangle has no equal sides. What type of triangle is it?
- A. scalene
- B. equilateral
- C. isosceles
- D. right-angled
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