Two Dimensional Shapes and Lines

Two dimensional shapes and lines are discussed here.

All solids are three dimensional in shapes. Solids are covered by faces. Thus the outer covers of a solid are called faces, i.e., surfaces. These surfaces may be plane or curved. The cuboid, cube etc. have plane surface, while sphere has curved surface. Some solids like cylinder have both plane and curved surfaces.

3-D shaped solids are covered by 2-D surfaces. If any two points are joined, a line segment is formed. In this chapter planes and lines will be discussed.

2-D plane figures

If the outlines of any face of a three dimensional face are drawn, a two dimensional plane figure is obtained.

Two dimensional shapes

Consider the following plane figures

         (i) Rectangle  

          (ii) Square

          (iii) Triangle

          (iv) Circle

(i) Rectangle: 


The outline of a face of a cuboid forms a rectangle. It has two pairs of opposite sides i.e., it has four sides. The opposite sides are equal. It has four corners i.e., vertices.

Here the name of rectangle is rect. ABCD.

A, B, C, D are corners or vertices of the rectangle.
Side AB = DC, Side BC = AD.

vertices of the rectangle




(ii) Square:

The outlines of a cube make a square. All its sides are equal to each other.

It has four corners or vertices.

PQRS is the name of the square whose sides PQ = QR = RS = SP and P, Q, R, S are four corners.

four corners or vertices of Square




(iii) Triangle:

A triangle has three sides and three corners.

DEF is a triangle whose sides are DE, EF and DF.

The triangle has three corners or vertices named D, E and F.

three corners or vertices of triangle




(iv) Circle:

The outline of the plane surface of a cone forms a circle.

It has a centre whose distance from any point on the outline is always the same.

This distance is called the radius of the circle.

A circle has no corner and no side.

no corner and no side of circle



The surfaces of rectangle, square, triangle and circle are plane surfaces. All the surfaces or faces of cuboid, cube i.e., books, matchbox, etc. are called plane. But the surface of a sphere i.e., ball is curved surface. A cylinder and cone have both curved and plane surfaces.


Color the Geometrical Shapes:

Color the triangles Blue

Color the Rectangles Green

Color the Circles Yellow

Color the squares Red

Color the Geometrical Shapes

● Geometry

You might like these




2nd Grade Math Practice

From Two Dimensional Shapes and Lines to HOME PAGE




Didn't find what you were looking for? Or want to know more information about Math Only Math. Use this Google Search to find what you need.



New! Comments

Have your say about what you just read! Leave me a comment in the box below. Ask a Question or Answer a Question.




Share this page: What’s this?

Recent Articles

  1. Worksheet on Addition of Mass | Word problems on Addition of Mass

    Nov 13, 24 10:24 AM

    Practice the third grade math worksheet on addition of mass/weight. This sheet provides different types of questions where you need to arrange the values of mass under different columns

    Read More

  2. Worksheet on Addition of Length | Word Problems on Addition of Length

    Nov 13, 24 09:23 AM

    Practice the third grade math worksheet on addition of length. This sheet provides different types of questions where you need to arrange the values of length under different columns to find their sum

    Read More

  3. Addition of Mass |Add the Different Units of Mass |Worked-out Examples

    Nov 12, 24 01:36 PM

    Adding Weight
    In addition of mass we will learn how to add the different units of mass or weight together. While adding we need to follow that the units of mass i.e., kilogram and gram are converted into grams

    Read More

  4. Measuring Mass | Addition and Subtraction of Mass | Measure of Mass

    Nov 12, 24 12:07 PM

    Standard Units to Measure Weight
    We will discuss about measuring mass. We know the vegetable seller is weighing potatoes in kilogram. The goldsmith is weighing a ring in grams. The wheat bags are weighing in quintals.

    Read More

  5. Subtraction of Length | Learn How the Values of Length are Arranged

    Nov 11, 24 02:08 PM

    Subtraction of Length
    The process of subtraction of units of length is exactly similar to that of subtraction of ordinary numbers. Learn how the values of length are arranged in different columns for the subtraction of len…

    Read More