Question

define a triangle and classify them on the basic of sides and angles

Answer 1

a figure having three sides and have a measure of all three angles equal to 180 degree..
on the basis of sides it is of three types.
1 scalene triangle.
2 isosceles triangle
3 equilateral

on the basis of angles
1 acute angle
2 obtuse angle
3 reflex angle
4 straight angle
5 right angle

Answer 2

A polygon having 3 sides, is called triangle.
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Types of triangle on the basis of sides :-

1.) Equilateral triangle ( all sides are equal)

2.) Isosceles triangle ( two equal and one unequal side)

3.) Scalene triangle ( all sides are unequal)
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Types of triangle on the basis of angles :-

1.) Acute angled triangle ( all angles are less than 90°)

2.) Right angled triangle ( one angle 90°)

3.) Obtuse angled triangle ( one angle is more than 90°)