Question

Help!
Find the area of the triangle and solve for x
Pic below

Answer 1

use Heron's formula for the area
\[A=\sqrt{s(s-a)(s-b)(s-c)}\qquad,s={a+b+c\over2}\]

Answer 2

\[s={13+5+12\over2}=?\]

Answer 3

15

Answer 4

good
then,
\[A=\sqrt{15(15-13)(15-5)(15-12)}=?\]

Answer 5

i only take 15(15-13) not the whole thing right?

Answer 6

no the whole thing

Answer 7

\[A=\sqrt{15\times2\times10\times3}=?\]

Answer 8

so just 15*(2)(10)(3)

Answer 9

ok that's what i thought

Answer 10

yep

Answer 11

so 900

Answer 12

forgot the suqre-root.. :)

Answer 13

30 is that for x

Answer 14

nope
thats the "Area"

Answer 15

oooh ok

Answer 16

now,
we also have the old formula
\[A={1\over2}\times{\rm base}\times{\rm height}\\30={1\over2}\times13\times x\]

Answer 17

so divide 30 by 13

Answer 18

yes, solve for "x"

Answer 19

x=4.61

Answer 20

yep. those are the things you are asked.

Answer 21

alright alright thank you very much

Answer 22

yer welcome.