# Thread: Finding Missing Triangle Lengths...

1. well the area formula for a triangle is always:

(1/2)(height)(base length)

(1/2)(sqrt(108))(12)

2. how do you enter that into a calculator? (graphing)

3. enter what? o.o?
(1/2)(sqrt(108))(12)?

first you calculate square root of 108 then multiply by 12 then by 1/2

4. what does that round to..

5. well i get the area = 62.35382907

6. ## So can I?

Can I leave it in:

A = 1/2(√108)(12)

7. yeah sure no harm in it. it is tidier to leave it in that form.

8. ## The Second Pic I sent!

Hey on the second pic I attached...I got this for the area..

1093.5 = 4.5 times 243...

9. lol xD you got it wrong.

you forgot to square root 243 and it is not multiplied with 4.5 but 18(0.5)

your working should be as below:

(x+y)^2 = 18^2 - 9^2
(x+y) = sqrt(243)

area = (1/2)(base length)(height)
= (1/2)(18)(sqrt(243))
= 140.2961154

10. ## Wait

I thought that √243 times √243 is 243...

11. no o.o" your height is sqrt(243) but your base length is 18 (length of one side of the triangle)

12. ## So..

4.5 times the square root of 243

take whatever that answer is and times it by two..

13. ic you are using the area of 2 triangles .. yup thats absolutely correct.

14. ## Check this out

I got an area of 72..because: 6 divided by 2 equals 3. times 12. equals 36. times that by 2..(two triangles) you get 72.

15. er where did you get your 6 from? dividing it with 2 and multiplying it with 12 is correct but 6 is not correct.

or if you area taking 6 as the base then 12 is not correct

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