Test your understanding of triangle classification.
Try to answer the questions before checking the answers at the bottom of the page.
Question 1
A triangle has angles 30°, 60°, 90°.
What type of triangle is it?
A) Acute
B) Right
C) Obtuse
Question 2
A triangle has angles 50°, 60°, 70°.
What type of triangle is it?
A) Acute
B) Right
C) Obtuse
Question 3
A triangle has sides 5, 5, 5.
What type of triangle is it?
A) Scalene
B) Isosceles
C) Equilateral
Question 4
A triangle has sides 4, 6, 7.
What type of triangle is it?
A) Scalene
B) Isosceles
C) Equilateral
Question 5
Can the sides 1, 2, 3 form a triangle?
A) Yes
B) No
Answers
1️⃣ B – Right triangle (contains a 90° angle)
2️⃣ A – Acute triangle (all angles less than 90°)
3️⃣ C – Equilateral triangle (all sides equal)
4️⃣ A – Scalene triangle (all sides different)
5️⃣ B – No because 1 + 2 = 3, which does not satisfy the triangle inequality rule.
Practice
- Take the Quiz
Continue Learning
- Types of Triangles
- Triangles (Basics)
- Sum of Angles of a Triangle is 180° (Proof)
- Find the Missing Angle of a Triangle
- Sum of Exterior Angles of a Triangle (Proof)
- Exterior Angle Theorem of a Triangle
- Two Exterior Angles at a Vertex are Equal (Proof)
- Two Exterior Angles are Equal at a Vertex (Quick Proof)