# 1st Class Mathematics Geometrical Shapes Geometrical Shapes

Geometrical Shapes

Category : 1st Class

GEOMETRICAL SHAPES

Geometrical Shapes

In this chapter, we will know about the basic geometrical shapes, which we often see around us.

Line

A line is a collection of points. The lines may be straight or curved.

See the picture of lines given below:

1. Straight lines

2. Curved lines

Angles

When two lines meet at a point, an angle is formed.

See the following figures:

(i)                        (ii)

These are angles.

•          Example:

Which one of the following is not an angle?

(a)                                                   (b)

(c)                                                      (d)

(e)   None of these

Explanation: Option (d) is correct because in (d), two lines do not meet to make an angle.

•          Example:

Which one of the following options has two angles?

(a)                                                  (b)

(c)                                                 (d)

Explanation: Option (a) is correct because it has three lines meeting at two points making 2 angles.

Triangle

A triangle has three sides and three angles. Let's see the following figures:

Quadrilateral has four sides and four angles. Let's see the following figures:

Thus it is clear that a quadrilateral has four sides whether they are equal or not.

Rectangle

A rectangle has equal angles and equal opposite sides. Let's see the following rectangles:

Square

Square has 4 equal sides and 4 angles. Let's see the squares given below:

Rhombus

Rhombus is a quadrilateral in which all four sides are equal. Let's see the pictures of rhombus given below.

•          Example:

How many lines are required to make 2 square?

(a) 4                                                                  (b) 8

(c) 12                                                               (d) 3

(e) None of these

Explanation: Option (b) is correct because one square has [4] lines.

So $[\,4\,]+[\,4\,]=[\,8\,]$lines are required to make [2] squares.

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