# 4.2.3. Triangles

Calculate the perimeter of the triangle.

Show Solutionis a triangle where cm, cm, and cm. Calculate its perimeter.

Show SolutionIf , , and , what is the type of according to the measures of its angles?

- Aacute triangle
- Bright triangle
- Cobtuse triangle

What is the type of according to its side lengths?

- Aequilateral triangle
- Bscalene triangle
- Cisosceles triangle

What is the type of the triangle according to the measures of its angles?

- Aright triangle
- Bacute triangle
- Cobtuse triangle

In a triangle , and . According to the measures of the angles, what is the type of the triangle?

- Aacute-angled
- Bobtuse-angled
- Cright-angled

If cm, cm, and cm, what is the type of according to its side lengths?

- Ascalene triangle
- Bisosceles triangle
- Cequilateral triangle

The triangle whose side lengths are cm, cm, and cm is called a scalene triangle.

- A4
- B11
- C9