The idea may be explained orally supported by the provision of an acute angled
triangle constructed with paper.
- Right angled triangle
A triangle with one of its angles equal to 90o is said to be a right angled triangle. In
a right angled triangle, the side opposite to the right angle is called as the hypotenuse
and the other two sides are termed as opposite side and adjacent side.
The idea may be explained orally supported by the provision of a right angled triangle
constructed with paper. Follow the procedure mentioned in the creative mathematics
section.
- Similar triangles
Two triangles are said to be similar if the measurements of their corresponding
sides are proportional. Note that in similar triangles, the angles of one triangle will
be equal to the angles of the other and the corresponding sides are in the same
proportion.
The idea of similar triangles may be taught to the child with the provision of two
triangles in which the measures of the corresponding sides are proportional. The
child needs to be assisted to measure the corresponding sides of the two triangles
and he/she must explained that the ratio between the corresponding sides are
equal.
A
B C
θ
