# 6.3 Geometry  (Page 5/7)

 Page 5 / 7
$\begin{array}{ccc}\hfill PS& =& \sqrt{{\left({x}_{1}-{x}_{2}\right)}^{2}+{\left({y}_{1}-{y}_{2}\right)}^{2}}\hfill \\ & =& \sqrt{{\left(0-2\right)}^{2}+{\left(-0.5-1\right)}^{2}}\hfill \\ & =& \sqrt{{\left(-2\right)}^{2}+{\left(-1.5\right)}^{2}}\hfill \\ & =& \sqrt{4+2.25}\hfill \\ & =& \sqrt{6.25}\hfill \end{array}$

and

$\begin{array}{ccc}\hfill QS& =& \sqrt{{\left({x}_{1}-{x}_{2}\right)}^{2}+{\left({y}_{1}-{y}_{2}\right)}^{2}}\hfill \\ & =& \sqrt{{\left(0-\left(-2\right)\right)}^{2}+{\left(-0.5-\left(-2\right)\right)}^{2}}\hfill \\ & =& \sqrt{{\left(0+2\right)\right)}^{2}{+\left(-0.5+2\right)\right)}^{2}}\hfill \\ & =& \sqrt{{\left(2\right)\right)}^{2}{+\left(-1.5\right)\right)}^{2}}\hfill \\ & =& \sqrt{4+2.25}\hfill \\ & =& \sqrt{6.25}\hfill \end{array}$

It can be seen that $PS=QS$ as expected.

The following video provides a summary of the midpoint of a line.

## Co-ordinate geometry

1. In the diagram given the vertices of a quadrilateral are F(2;0), G(1;5), H(3;7) and I(7;2).
1. What are the lengths of the opposite sides of FGHI?
2. Are the opposite sides of FGHI parallel?
3. Do the diagonals of FGHI bisect each other?
2. A quadrialteral ABCD with vertices A(3;2), B(1;7), C(4;5) and D(1;3) is given.
2. Find the lengths of the sides of the quadrilateral.
3. ABCD is a quadrilateral with verticies A(0;3), B(4;3), C(5;-1) and D(-1;-1).
1. Show that:
2. AB $\parallel$ DC
2. What name would you give to ABCD?
3. Show that the diagonals AC and BD do not bisect each other.
4. P, Q, R and S are the points (-2;0), (2;3), (5;3), (-3;-3) respectively.
1. Show that:
1. SR = 2PQ
2. SR $\parallel$ PQ
2. Calculate:
1. PS
2. QR
5. EFGH is a parallelogram with verticies E(-1;2), F(-2;-1) and G(2;0). Find the co-ordinates of H by using the fact that the diagonals of a parallelogram bisect each other.

## Transformations

In this section you will learn about how the co-ordinates of a point change when the point is moved horizontally and vertically on the Cartesian plane. You will also learn about what happens to the co-ordinates of a point when it is reflected on the $x$ -axis, $y$ -axis and the line $y=x$ .

## Translation of a point

When something is moved in a straight line, we say that it is translated . What happens to the co-ordinates of a point that is translated horizontally or vertically?

## Discussion : translation of a point vertically

Complete the table, by filling in the co-ordinates of the points shown in the figure.

 Point $x$ co-ordinate $y$ co-ordinate A B C D E F G

What do you notice about the $x$ co-ordinates? What do you notice about the $y$ co-ordinates? What would happen to the co-ordinates of point A, if it was moved to the position of point G?

When a point is moved vertically up or down on the Cartesian plane, the $x$ co-ordinate of the point remains the same, but the $y$ co-ordinate changes by the amount that the point was moved up or down.

For example, in [link] Point A is moved 4 units upwards to the position marked by G. The new $x$ co-ordinate of point A is the same ( $x$ =1), but the new $y$ co-ordinate is shifted in the positive $y$ direction 4 units and becomes $y$ =-2 +4 =2. The new co-ordinates of point A are therefore G(1;2). Similarly, for point B that is moved downwards by 5 units, the $x$ co-ordinate is the same ( $x=-2,5$ ), but the $y$ co-ordinate is shifted in the negative $y$ -direction by 5 units. The new $y$ co-ordinate is therefore $y$ =2,5 -5 =-2,5.

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Joseph
Hello, if I study Physics teacher in bachelor, can I study Nanotechnology in master?
no can't
Lohitha
where we get a research paper on Nano chemistry....?
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
Ali
what are the products of Nano chemistry?
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
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da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
hey
Giriraj
Preparation and Applications of Nanomaterial for Drug Delivery
revolt
da
Application of nanotechnology in medicine
has a lot of application modern world
Kamaluddeen
yes
narayan
what is variations in raman spectra for nanomaterials
ya I also want to know the raman spectra
Bhagvanji
I only see partial conversation and what's the question here!
what about nanotechnology for water purification
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
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Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
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Rafiq
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Damian
How we are making nano material?
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LITNING
scanning tunneling microscope
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what is differents between GO and RGO?
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if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
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Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
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what is Nano technology ?
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
how did you get the value of 2000N.What calculations are needed to arrive at it
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