Question

Use the triangle in the coordinate plane to find the perimeter.

Answer 1

We could use right triangles to figure out each individual length.

Answer 2

it looks like you have to use the distance formula 3 times
(but the horizontal line is easy... count the boxes)

Answer 3

would the box with the two be considered a full square?

Answer 4

i dont remember it refresh me

Answer 5

\[a^2+b^2=c^2\]

Answer 6

how do i find c?

Answer 7

Use the formula that I gave you.

Answer 8

ooohhh im stupid

Answer 9

c =8

Answer 10

right?

Answer 11

\[c^2=8\]

Answer 12

if you have time, see
http://www.khanacademy.org/math/algebra/linear-equations-and-inequalitie/more-analytic-geometry/v/distance-formula

for how to do this

Answer 13

what does d= stand for in this question

Answer 14

That is also a very good method @phi
I just figured that since it is such a simple triangle, this way would be more simplistic.

Answer 15

BC
d=
what does this mean?

Answer 16

the distance formula is really using the pythagorean thm...

Answer 17

how do i find d=

Answer 18

you have 3 legs: AC , BC and AB
have you found the length of any of them ?

Answer 19

2, 2, and 8

Answer 20

wait no

Answer 21

ok yeah

Answer 22

right?

Answer 23

let's first do leg BC. how many steps does it take to get from B to C ?

Answer 24

7

Answer 25

yes, so make a note BC= 7

now let's find the length of side AC

as austin showed you , you must use the pythagoras to find the length, because it is slanted.

if you go check his post, it shows that to get from point C to point A you go 2 over, and 2 up

you can make that into a triangle: