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**11**on Mon Nov 17, 2014 1:04 pm

# 3D trig problem

## Re: 3D trig problem

Wait what do we have to find?

**Thimodya/Waspinator**- Posts : 10

Points : 10

Join date : 2010-10-03

## Re: 3D trig problem

okay i think i got it my answer was 59 degrees

i dont think theres any need for codecogs here so ill jst type it directly:

firstly i took the square base and found AC which is 18.526 i used Pythagoras for this by spliting the square base and then acting like it was a right angled triangle

next i found VED by dividing 18.526 by 2 (9.263) to get another right angled triangle but this time its vertical.

i no the side VD is 18.2

and the side ED is 9.263

so then its adjacent over hypotenuse so its Cos

so cos = 9.263/18.2

cos=0.5089

cos^-1(0.5089)

this equals the angle from the edge of the square to the base of the triangle

59.405 but to give it to the closest degrees

59 degrees

maybe i shuld have used codecogs :s

anyways that was fun

i dont think theres any need for codecogs here so ill jst type it directly:

firstly i took the square base and found AC which is 18.526 i used Pythagoras for this by spliting the square base and then acting like it was a right angled triangle

next i found VED by dividing 18.526 by 2 (9.263) to get another right angled triangle but this time its vertical.

i no the side VD is 18.2

and the side ED is 9.263

so then its adjacent over hypotenuse so its Cos

so cos = 9.263/18.2

cos=0.5089

cos^-1(0.5089)

this equals the angle from the edge of the square to the base of the triangle

59.405 but to give it to the closest degrees

59 degrees

maybe i shuld have used codecogs :s

anyways that was fun

**fergus**- Posts : 18

Points : 29

Join date : 2010-10-03

Age : 107

## HELP!!

what is meant by the plane angles!

**Luka a.k.a GodOfRandom**- Admin
- Posts : 13

Points : 14

Join date : 2010-10-03

## Re: 3D trig problem

Uh........im not sure......but i think fergus did it correct

**Thimodya/Waspinator**- Posts : 10

Points : 10

Join date : 2010-10-03

## does it answer the question

What angle are we looking for and does Fergus' solution answer the questions?

tip: mymaths!

tip: mymaths!

**Admin**- Admin
- Posts : 62

Points : 71

Join date : 2010-10-02

## Re: 3D trig problem

ime not sure what the answer is but i believe the to find the answer you need to create a triangle intersecting the the middle of both planes since if you use the edges length of the pyramids triangle going to the corner you are not working out the planes angle but the corners angle to the base of the pyramid making this problem far more difficult however as i said ime not sure and could easily be wrong.

**Luka a.k.a GodOfRandom**- Admin
- Posts : 13

Points : 14

Join date : 2010-10-03

## Re: 3D trig problem

I belive in luka

Btw i lost that sheet for hw...

If anyone has a scanner and a uncomplete hw sheet can u send me a scan?

Ty

Btw i lost that sheet for hw...

If anyone has a scanner and a uncomplete hw sheet can u send me a scan?

Ty

**fergus**- Posts : 18

Points : 29

Join date : 2010-10-03

Age : 107

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