Question

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

Answer 1

this one has 2 sides that are easy to find the length of, just count.

what is AB ?

Answer 2

5?

Answer 3

yes. if it were a city block you would walk 5 blocks

Answer 4

AC is ?

Answer 5

square it?

Answer 6

how many steps over and up to get from A to C ?

Answer 7

oh 3

Answer 8

yes 3 over 0 up

if we use the formula

c^2 = a^2 + b^2
and put in 3 for over and 0 for up we get
c^2 = 9 + 0
c^2 =9
c= 3

the formula still works, but it is easier to notice the length is 3

Answer 9

now BC ?

Answer 10

and BC is 5.8

Answer 11

yes

Answer 12

finally, the perimeter

Answer 13

ok and the perimeter is 13.8

Answer 14

now take a break and watch this
http://www.khanacademy.org/math/algebra/linear-equations-and-inequalitie/more-analytic-geometry/v/distance-formula

Answer 15

ok

Answer 16

ok yeah i knew that a little it just dosent want to stay in my head