C3 Trigonometry help

http://www.mediafire.com/view/j31wsh39pks6zzl

I only need help on the first part, the rest seem easy to me. I find it hard to set up the equations and start it off. I'm guessing perimeter is involved. :confused:

Thank you for any help :smile:

Reply 1

joostan

13

Original post by krisshP

http://www.mediafire.com/view/j31wsh39pks6zzl

I only need help on the first part, the rest seem easy to me. I find it hard to set up the equations and start it off. I'm guessing perimeter is involved. :confused:

Thank you for any help :smile:

It's a bit of geometry. Consider the angles in the triangles and the width of the 2.5m thingy :smile:

Reply 2

username1230506

1

first of all draw a straight line from one end of the passage to the other end with the line just touching point A. That should give you a right angle triangle with side AD and another right angle triangle with side AB

Reply 3

krisshP

OP

14

Original post by joostan

It's a bit of geometry. Consider the angles in the triangles and the width of the 2.5m thingy :smile:

Thanks for the quick response :smile:

I think I now know what you mean :biggrin:

Later I'll try some stuff and tell you the outcome.

Thanks

Reply 4

krisshP

OP

14

Original post by FanTesticles

first of all draw a straight line from one end of the passage to the other end with the line just touching point A. That should give you a right angle triangle with side AD and another right angle triangle with side AB

Damm, that's exactly what I just was thinking with Joostan's advice.

Reply 5

username1230506

1

the angle between AD and the wall is theta. the angle between AB and the wall is 90 minus theta.

Reply 6

krisshP

OP

14

Original post by FanTesticles

the angle between AD and the wall is theta. the angle between AB and the wall is 90 minus theta.

Yeah, I know. Stop doing the rest please, I want to do it :smile:

Reply 7

joostan

13

Original post by krisshP

Thanks for the quick response :smile:

I think I now know what you mean :biggrin:

Later I'll try some stuff and tell you the outcome.

Thanks

No problem :smile:

Reply 8

krisshP

OP

14

Original post by joostan

No problem :smile:

Original post by FanTesticles

first of all draw a straight line from one end of the passage to the other end with the line just touching point A. That should give you a right angle triangle with side AD and another right angle triangle with side AB