Homework Help: Triangle plane surface 2m base and 3 height

1. Apr 22, 2012

manal950

Hello ..

This is a question with answer , From where " 1 " in the solution ?

http://store1.up-00.com/Mar12/yd170715.jpg [Broken]

Last edited by a moderator: May 5, 2017
2. Apr 22, 2012

manal950

see here

http://store1.up-00.com/Mar12/uK579693.jpg [Broken]
and
http://store1.up-00.com/Mar12/D4a79693.jpg [Broken]

Last edited by a moderator: May 5, 2017
3. Apr 22, 2012

manal950

where are you ?

4. Apr 23, 2012

manal950

similar question , but here first find angle

http://store1.up-00.com/Mar12/61270702.jpg [Broken]

Last edited by a moderator: May 5, 2017
5. Apr 23, 2012

manal950

Where are you ??
that question which I want only about sin

sin = o/h

but my Q now
h= 1 why
is because 3/3
or 2 / 2

6. Apr 23, 2012

LawrenceC

Your question is unclear to me.

7. Apr 23, 2012

manal950

I mean
sin30 = y/1
So Xbar = 1.5 + y
So Xbar = 1.5 + 1Xsin30

Now my question from where we got (one)
Is by divide 3/3 as (h/3 ) = 1 or what ?.

8. Apr 23, 2012

LawrenceC

The base of the triangle is the part closest to the surface. If triangle height is 3, the centroid of a triangle is 1/3 the distance from the base to the apex opposite the base. 1/3 of 3 is 1 and 1 is the hypotenuse.

9. Apr 23, 2012

manal950

thanks sooooooooooo much .. where are you before ... ^)^ ?

10. Apr 23, 2012

LawrenceC

Mowing the front lawn.