Final Cover - For Printing

Two or more embossed concentric circles be prepared on a sheet of paper and the child be asked to explore. Tactually, the child ...

That is, r 1 + r 2 > d Therefore for intersecting circles, sum of the lengths of radii is greater than the distance between t ...

If r 1 and r 2 denote the radii of the two circles touching externally and ‘d’ is the distance between their centers then, r 1 + ...

ANGLES Angle An angle is a measure formed by two rays with a common starting point. In other words, the space between two lines ...

Right angle Any angle which measures exactly 90^0 is said to be a right angle. The idea can be taught by using the paper foldin ...

The procedure followed in teaching the idea of acute angle may be followed to enable the child to understand the idea of obtuse ...

angle. Enable the child to affix the four pieces together, so that no space is left in between them. Also teach the child that w ...

angles separately, the child understands fact that the two angles add up to a straight angle thus making the two angles suppleme ...

The procedure followed in teaching the concept of bisector of an angle is to be repeated as it is. Now the child may be allowed ...

Three embossed lines, in which two of them are parallel to each other and the third one passing through the other two is to be p ...

TRIANGLES Triangle A triangle is a closed figure formed by three line segments. In other words, a triangle is a plane figure wi ...

Types of triangles Triangle can be classified into three kinds according to their sides as scalene triangle, isosceles triangle ...

Related ideas like the side opposite to the greatest angle of the triangle is the longest side and vice-versa may also be explai ...

The idea may be explained orally supported by the provision of an acute angled triangle constructed with paper. Right angled tr ...

Equiangular triangles When the corresponding angles of two triangles are exactly the same they are said to be equiangular trian ...

Congruency Two objects identical in shape and size are said to be congruent. In geometry, congruency refers to two figures with ...

Module 72 : Quadrilaterals QUADRILATERALS Polygon A polygon is a plane figure formed by many line segments. The word ‘poly’ mea ...

quadrilateral. Square, rectangle, rhombus, parallelogram and trapezium are some of the quadrilaterals. Shapes of these quadrilat ...

Note : 1. If all the sides are equal but not at right angles to each other, then it becomes a rhombus. The area of square is (s ...

shape. Once the child conceptualizes the shape of a trapezium, relevant related concepts are to be explained. A paper which is c ...