**CONTENT**

(1) Angle sum of a triangle

(2) Angles on a straight line

(3) Angles at a point

__Angle sum of a triangle__

(a) **Definition:** A Triangle is a three-sided plane figure with three angles.

(b) **Types of triangles**

(i) Scalene triangle

(ii) ** An Isosceles Triangle:** This type of triangle has two adjacent sides equal and two angles equal

(iii) __An Equilateral Triangle__

This type of triangle has all its sides equal and all its angles equal each angle is 60^{0}.

(iv) ** An Acute angled triangle** This type of triangle has each of its angle less than 90

^{0}i.e. each angles is acute.

(v) __An Obtuse angled triangle__

This type of triangle has one of its angles more than 90^{0}.

(vi) __A right – angled triangle__

This triangle has one of its angles equal to 90^{0}. The side opposite the right angle is the longest side and is often called hypotenuse.

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