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 600.
(iv) An Acute angled triangle This type of triangle has each of its angle less than 900 i.e. each angles is acute.
(v) An Obtuse angled triangle
This type of triangle has one of its angles more than 900.
(vi) A right – angled triangle
This triangle has one of its angles equal to 900. The side opposite the right angle is the longest side and is often called hypotenuse.
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