### Mathematics Class VI

Knowing Our Numbers
Whole Numbers
Playing With Numbers
Basic Geometrical Ideas
Fractions
Integers
Decimals
Data Handling
Mensuration
Algebra
Ratio and Proportion
Practical Geometry
Symmetry

# Understanding Elementary Shapes

Before, being able to solve the sums we need to understand certain concepts. Firstly, acute angles are angles less than a right angle. Secondly, obtuse angles are angles which are greater than a right angle but lesser than a straight angle. Thirdly, reflex angles are angles which are greater than a straight angle. Fourthly, right angle is a angle that is equal to .

One complete revolution is equal to . Therefore, each part is divided into equal parts, where each part is called a degree.

Perpendicular lines are lines which form a right angle between them. A perpendicular bisector divides a line into two equal parts.

There are three different types of triangles :-

• Scalene – All sides are of different lengths.
• Equilateral – All sides and angles are equal to each other.
• Isosceles – Two sides are equal to each other.

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