Qualification > Math
IGCSE Maths doubt(paper 4)
@d!_†oX!©:
its not merely a habit bro....its our moto
haha
EADA's moto
~~~~shreyapril~~~~:
haha
thanx
By the way om me or ans my question here only!!
if you dont mind!!
By the way wait a sec there is one more question to come check my thread abt ad. math!!
i'll post it there!!
Alpha:
--- Quote from: A@di on October 31, 2009, 03:10:29 pm ---@nid - show how did u use the distance formula?
-----
BC = k-6)i + 15j
therefore
(k-6)2 = 252 - 152 = 400
= 20
hence, k = 26
--- End quote ---
I answered the second part only... He or she just asked for second part...lol
That's the first part! Distance formula is used in 2nd part...
Alpha:
Hey... The Distance Formula is derived from the Pythagoras' Theorem... That's not difficult to understand.
Use the graphical method...
Draw any inclined line on a Cartesian Plane.
I have attached a file to this post. Refer to it.
Let A (x, y) and B(x1, y1).
To find the distance between A and B, i.e, the bold black inclined line, you will need to find the length of the two red dotted lines I have named x and y.
Using Pythagoras' Theorem,
Square of longest side = Sum of squares of the two smallest sides.
Send square to the other side...
>>> Longest side= Sq. root of the sum.
And to find the two smallest sides:
x = 3 - 0 [y1 - y]
y = 3 - 0 [x1 - x]
Note that the triangle formed is a right-angled one.
And now substituting the values for x and y, you will come back to the distance formula given.
Actually, this formula is just another way of using the Pythagoras' Theorem. A diagram would help. But it takes time to draw... Maybe by Tuesday, I'll post the diagram here... It would be easy to understand then.
This formula is used both in Maths and Add Maths.
Good Luck!
nid404:
Gradient formula should be used for the second 1....but for the first one i think we need to used distance formula....they did something else.....
so aadi....could u use the distance formula FOR the first one ??
@alpha-i know he asked for the 2nd one ans I know the stuff.....I was asking abt the first part cuz I used the distance formula for the first one and got a different answer
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