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How many lines of symmetry
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Click on the correct answer.

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How many lines of symmetry
      
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Elementary math lessons to learn
'How many lines of symmetry' for 3rd grade

How many lines of symmetry do different shapes have?

Lines of symmetry are imaginary lines that you can draw through a shape that divide the shape into two halves that are exact mirror images of each other. Different shapes have different numbers of lines of symmetry:

Square: A square has four lines of symmetry - one vertical, one horizontal, and two diagonal lines. Each line of symmetry divides the square into two halves that are mirror images of each other.

Rectangle: A rectangle has two pairs of opposite sides of equal length and four right angles. It has two lines of symmetry - one vertical and one horizontal.

Triangle: The number of lines of symmetry a triangle has depends on the type of triangle it is. An equilateral triangle has three sides of equal length and three equal angles. It has three lines of symmetry - one vertical and two diagonal lines. An isosceles triangle has two sides of equal length and two equal angles. It has one line of symmetry - the line that goes through the midpoint of the base and bisects the opposite angle. A scalene triangle has no lines of symmetry.

Kite: A kite has one line of symmetry - the line that goes through the midpoint of the shorter diagonal and bisects the longer diagonal.

Pentagon: A regular pentagon has five sides of equal length and five equal angles. It has five lines of symmetry - one vertical, one horizontal, and three diagonal lines. Regular shapes with more sides like hexagon and octagon have the same number of lines of symmetry as they have sides. So a regular octagon has 8 lines of symmetry.

In this topic you are shown a series of diagrams of regular 2D shapes. You must give the number of lines of symmetry for each shape.

With these interactive math lessons you will be learning "How many lines of symmetry" from
3rd grade / Shapes in 3 easy steps. The math in our lessons consists of 11 questions that ask you to identify the number of lines of symmetry each shape has.

Show lesson introduction
1 / 11
The number of lines of symmetry that a square has is 4
4
2 / 11
The number of lines of symmetry that a rectangle has is 2
2
3 / 11
The number of lines of symmetry that an equilateral triangle has is 3
3
4 / 11
The number of lines of symmetry that this right angle triangle has is 0
0
5 / 11
The number of lines of symmetry that this isosceles triangle has is 1
1
6 / 11
The number of lines of symmetry that a rhombus has is 2
2
7 / 11
The number of lines of symmetry that a parallelogram has is 0
0
8 / 11
The number of lines of symmetry that a kite has is 1
1
9 / 11
The number of lines of symmetry that this pentagon has is 5
5
10 / 11
The number of lines of symmetry that this hexagon has is 6
6
11 / 11
The number of lines of symmetry that this octagon has is 8
8

There are 3 easy math lesson activities in this "How many lines of symmetry" tutorial. These activities progress step by step to help you the learner gradually master this math topic. The activities are based on "3 stage questioning", a method of learning that quickly and easily builds your confidence as you work through the short series of lessons that strengthen your knowledge of the math that you want to learn.

When you have completed the tutorial for a topic, you should try some of our games before finally doing the test for your chosen topic. See the Help box below for detailed instructions on how to use the lesson activities to help you learn your math more easily.

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How to use our tutorials to learn
'How many lines of symmetry' for 3rd grade

Introduction to the math topic

You start the tutorial with a lesson that introduces the math you will be learning. You will see a set of questions one at a time, and for each question you will see the written answer and also hear the answer to that question.

Repeat the question/answer by clicking on the brown speaker sign. Repeat the question/answer and expand the question graphic by clicking on the question box. Move between questions using the arrow buttons below the question. If there is additional information available for your chosen topic, the "i" button on the left upright bar will be brown on white. Click on the button to load the additional lesson information into the main interface.


Either / Or math lesson

This lesson moves on from the "Introduction" lesson and offers you two possible answers to each question. So, you will see a question then a voice will ask "Is this ... or is it ..." and you will have to choose which of the answers is the one that matches the question.

You choose an answer by clicking or tapping on one of the two answer boxes below the question. You can play the audio for each answer again by clicking on the speaker icon beside the written answer (if robot speech is available and enabled). The program will let you know each time whether you answered correctly. A star will light up red for a wrong answer or white/black for a correct answer.

This lesson asks you the questions in a random order compared to the introduction. At the end of the lesson, you can choose whether to repeat the lesson or move on to the next one.


What is it? math lesson

The final lesson of the tutorial shows you multiple possible answers for each question - you must choose the correct one. You are asked a question and below it are a list of two, three, or four possible written/numeric answers from this topic. Pressing the speaker icon will play the math audio for that answer.

For each picture, click on the answer that matches the question. The program will tell you whether you are right or not. As with the Either / Or activity a system of stars indicate your right and wrong answers. The What is it? lesson will show you all the questions you learned in the Introduction but in a random order.


When you complete the "What is it?" lesson, you can choose whether to go on to play some games with this topic, or whether you want to repeat some or all of the lesson activities in this tutorial. You should expect to get 80% of the answers correct in most of the activities before trying some of the Math games with this topic.

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