- Types of triangles
Triangle can be classified into three kinds according to their sides as scalene triangle,
isosceles triangle and equilateral triangle.
According to angles, triangles are again classified into three kinds as acute angled
triangle, right angled triangle and obtuse angled triangle.
The idea may be explained orally, in addition to the provision of different types of
triangles constructed with paper.
- Equilateral triangle
A triangle with all its three sides equal is said to be an equilateral triangle. Note that
if the three sides are equal then each of the three angles will also be equal to 60o.
Explain the idea verbally. To enable the child to understand the idea better construct
an equilateral triangle through paper folding and explain.
Related ideas such as sides opposite to equal angles are always equal and vice-versa
etc., may also be explained simultaneously.
- Isosceles triangle
A triangle in which at least two sides are of the same length is called isosceles
triangle. The idea may be explained orally supported by the provision of an isosceles
triangle constructed with paper.
A
B C
A
B C
