Lesson 14. Loci and Constructions | Maths Session for Grade 09

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About DP Education
The DP education was born out of the passion of Mr. Dhammika Perera to provide an innovative online math learning platform for school students to enhance their math skills. School students can access the government math curriculum from grades 6-13 at their own convenience for free.

DP Education (in English)
Students who wish to learn Math can watch the video and learn the subject at their convenience. Here math is taught in an easy way and in simple language.
You can also watch and learn math in Sinhala and Tamil languages by clicking to the links below.

CHAPTER DESCRIPTION (in this video)

This video is a lesson on Loci and Constructions - Grade 9.
By studying this lesson you will be able to
• identify four basic loci,
• construct a line perpendicular to a given line,
• construct the perpendicular bisector of a straight line segment,
• construct and copy angles,
• solve problems related to loci and constructions.

Maths can not be learnt if you leave in between the class. So, we have provided break in between our online class at regular intervals.

Please go through the previous chapter on Rounding off and Scientific Notation here

Please go through the next chapter on Equations here

You can ask your doubts and any questions related to this chapter in the message section below, and our teacher will reply back at the earliest. Also, do attend our live QnA Sessions, which are conducted from time to time, and we post the announcement on our social media platforms.

The link is given below:-

You can also visit Mr. Dhamikka Perera's Youtube channel to know more about his vision on DP Education and the initiative at

For our graduate, postgraduate and upskilling students, we also provide a large number of free courses from various prestigious universities across the world through our website:

Our Motto is "Learn what you love" and we will work hard to make learning enjoyable for you.

#DPEducation #Grade9MathsEnglish #Loci
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The fact that my whole school recognizes your U tube channel to ace their exams is just lit !!
I really appreciate it... Special thanks for DP EDUCATION

aaminarushdy
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Im always getting lower marks in maths😢

SathyarajaKavinash-iltc
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Thank u very much teacher, lesson is very clear ....

sisirakumara
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Thank you very much for your great help teacher 😀 👍

kanchanakanchana
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What a lesson ❤️
Well explained mam
Thank u for ur dedication
Thank u so much ❤️😘

vindyakaumadiedodampegama
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Got a lot of information regarding this lesson. It was a great support for our exams.Thankyou sooo much.

anastastronach
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Thank you tr this lesson is clear more than school

A...f-
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many thank you tr.... the lesson is learned well...🙏 🙏 ❤

chandimakapuarachchi
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Got a crystal clear idea. Thank you Ma'am

voicedeiya
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Thanks u very much, you are best teacher

abdulsathar
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Miss very nice explanation pls continue it and also it is a great support

teajin
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Exercise 14.1 question no 4 i is incorrect
There are two places for C on either side of the line
4 ii also incorrect it apply a line in between a
A and B

nalakabollore
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Hello Teacher. Appreciation for ypur great affort. Can we use ruler here instead of set square

thevalathathayalan
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Lowkey I understood this loci lesson 😝👍

baller
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Pls start teach english medium science pls pls

rohanakulasooriya