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The Classification of math diary's Triangle for Grade Four Primary School Students
Today, the math teacher taught us the classification of triangles. I learned a lot of knowledge.

1, all three angles of an acute triangle are acute angles.

2. A right triangle has one right angle and the other two angles are acute angles.

3. An obtuse triangle has an obtuse angle and the other two angles are acute angles.

An isosceles triangle has two equal sides and two equal base angles.

An equilateral triangle has three angles, and all three inner angles are 60 degrees.

6. The sum of the three angles of a triangle is 180 degrees.