the coordinates of the of the vertices of a triangle are A(1,3), B(9,10), and C(11,18). find the perimeter of triangle ABC. Find the perimeter of the triangle when the coordinates are multiplied by 3.

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- anonymous

- schrodinger

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- anonymous

anyone please help meh?

- sohailiftikhar

do you know the formula of perimeter of triangle ?

- anonymous

you um add the three sides up?

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## More answers

- sohailiftikhar

wait

- anonymous

ok

- anonymous

have you finally found an answer? it's 2 here :O

- anonymous

yayyyyyyyyyyyyyy

- sohailiftikhar

first answer is 36.89

- anonymous

at least give me the three numbers to add...

- sohailiftikhar

ok

- sohailiftikhar

A(1,3), B(9,10), and C(11,18). then the sides will be AB,BC,CA

- sohailiftikhar

so now you can find the sides ig

- anonymous

just need the three sides' number that all

- sohailiftikhar

AB=B-A=(9-1)(10-7)=8i+3j now find it's magnitude

- anonymous

btw when the sides all multiply by 3 the perometer just get multiplied by 3 right?

- anonymous

does it have to be that complicated?

- sohailiftikhar

yes

- sohailiftikhar

first you have to find sides by distance formula then have to add then that's all .

- anonymous

\[\sqrt{(y_1+y_2)^2+(x_1+x_2)^2}\]

- anonymous

that's the formula for finding a side i THINK

- sohailiftikhar

yes

- anonymous

but when i plugged it in i got \(\sqrt{113}\)

- anonymous

but how do u add them TOGETHER :O

- anonymous

well... you are a HUMAN calculator, right?

- anonymous

:P

- anonymous

Use matrix method

- anonymous

?

- anonymous

here's what i need: i need the three numbers for the sides of the triangle, the answers for the 3 questions, and a explanation for the last question.

- anonymous

Well let me think 2 mins plz

- anonymous

ok

- anonymous

the formula to find the sides are --
Distance from A to B = |dw:1441269476718:dw|
In that way you can find all the sides and then for the parameter
the formula is , parameter = AB+BC+AC

- anonymous

and i know that.

- anonymous

then what's the problem solve it

- anonymous

XD XD

- anonymous

idk i get a diff answer every time that's why i needa check the sides and the answer bruh!

- anonymous

well tell me your answer. I am solving it

- anonymous

well which one? i have like 20 different answers

- anonymous

well is there root of(113)?

- anonymous

no...

- anonymous

side AB = root of (113)

- anonymous

Side BC= root of (68)

- anonymous

ok.

- anonymous

and side CA = root of (325)

- anonymous

then the perimeter is
[ root of 113+ root of 68+root of 325]

- anonymous

ok...

- anonymous

are you able to do the sum?

- sohailiftikhar

and answer is 36.89

- sohailiftikhar

which i have told before

- anonymous

its not likie absolute tho like ther eare decimals and stuff

- anonymous

the answer is 36.90

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