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**Understanding Elementary Shapes |Speed Notes**

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The distance betweenthe end pointsof a line segment is its length. A graduatedruler and the divider are useful to compare lengthsof line segments. When a hand of a clock moves from one position to another position we have an examplefor an angle. **(Scroll down to continue …)**

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One full turn of the hand is 1 revolution.

A right angle is ¼ revolution and a straight angle is ½ a revolution. We use a protractor to measure the size of an angle in degrees.

The measure of a right angle is 90° and hence that of a straight angle is 180°.

An angle is acute if its measure is smaller than that of a right angle and is obtuseif its measure is greaterthan that of a right angle and less than a straightangle.

A reflex angle is largerthan a straight angle.

Two intersecting lines are perpendicular if the anglebetween them is 90°.

The perpendicular bisector of a line segmentis a perpendicular to the line segmentthat divides it into two equal parts.

Triangles can be classified as follows based on their angles:

Triangles can be classified as follows based on the lengths of their sides:

Polygons are namedbased on theirsides.

Quadrilaterals are furtherclassified with reference to their properties.

·We see aroundus many three dimensional shapes.Cubes, cuboids, spheres,

cylinders, cones,prisms and pyramidsare some of them.

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- WHOLE NUMBERS | Study
- KNOWING OUR NUMBERS | Study
- PLAYING WITH NUMBERS | Study
- BASIC GEOMETRICAL IDEAS | Study
- UNDERSTANDING ELEMENTARY SHAPES | Study
- INTEGERS | Study
- FRACTIONS | Study
- DECIMALS | Study
- DATA HANDLING | Study
- MENSURATION | Study
- ALGEBRA | Study
- RATIO AND PROPORTION | Study
- CBSE 6 | Mathematics – Study – Premium

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