**TRIANGLES**

**CONTENT**

- Triangle and its types
- Inscribed and circumscribed circles in a given triangle

**Triangle and its Types**

A triangle is a plane figure bounded by three straight lines. The figure below shows the typical shape of a triangle. The sum total of all the angles in a triangle is 180^{o}. Triangles are described by

- the lengths of their sides
- the sizes of their angle; and
- a combination of both lengths of sides and sizes of angles

**Types of Triangle**

1. Right angled triangle: A right-angled triangle has one angle equal to 90^{o}. The side opposite the 90^{o }is called the hypotenuse.

2. Equilateral triangle: An equilateral triangle has all the three sides and angles equal.

3. Isosceles triangle: An Isosceles triangle has two equal sides and angles.

4. Scalene triangles: – a scalene triangle has three unequal sides and angles.

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