Question

What is the perimeter of triangle JKL?
J =-1, 2
k=3, 2
L=3, 4


Round your answer to the nearest tenth.



A.
8.6 units

B.
9.6 units

C.
10.5 units

D.
11.5 units

Answer 1

Could you help? @jim_thompson5910

Answer 2

the perimeter is simply the sum of all of the sides (basically you add up the side lengths)

Answer 3

this triangle has the sides: JK, KL, JL

so you need to use the distance formula to find the lengths of the sides listed above

Answer 4

does that make sense @vicyoria15 ?

Answer 5

Yes it does

Answer 6

so i basically just add up all the points??

Answer 7

ok great, let me know what you get for the side lengths

Answer 8

no not the points

Answer 9

what is the distance from J to K?

Answer 10

4?....

Answer 11

correct

Answer 12

so JK is 4 units long

Answer 13

okay so i added all the sides and i got 10

Answer 14

how long is KL ?

Answer 15

kl is 2

Answer 16

JK = 4
KL = 2

how about JL ?

Answer 17

4 also

Answer 18

no

Answer 19

J = (-1,2)
L = (3,4)

Answer 20

5?

Answer 21

subtract the coordinates, square the result, then add the squares and take the square root

Answer 22

it looks like 4 but its hard to telll

Answer 23

notice we go from x = -1 to x = 3

that's a difference of ???

Answer 24

1?

Answer 25

-1 minus 3 = ??

Answer 26

oh its -4

Answer 27

sorry

Answer 28

square that to get ??

Answer 29

16

Answer 30

now do the same for the y coords

Answer 31

and you get ??

Answer 32

...You lost me...

Answer 33

J = (-1,2)
L = (3,4)

what are the y coordinates?

Answer 34

2 and 4

Answer 35

subtract them, then square that result

Answer 36

i got 4

Answer 37

yes

Answer 38

for the x coordinates, we subtracted and squared the result to get 16
for the y coordinates, we subtracted and squared the result to get 4

add the squares: 16+4 = 20

Answer 39

then you take the square root

\[\Large \sqrt{20}\]

Answer 40

that's the exact distance from J to L

Answer 41

4.4

Answer 42

what comes after the second 4?

Answer 43

7

Answer 44

so roughly 4.47, yes

Answer 45

JK = 4
KL = 2
JL = 4.47 (approximate)

Answer 46

add up: JK, KL and JL

to get the perimeter

Answer 47

i got 10.47

Answer 48

that rounds to 10.5

Answer 49

so rounded to the nearest tenth its 10.5 right?

Answer 50

correct

Answer 51

sorry i typed without seeing what you said haha
Thanks so much, you teach me better than my teachers!

Answer 52

I'm glad I could help out