Trusses METHOD OF JOINTS, NO Reactions Needed, in 3 Minutes!

[@zaidalzanoon4877]

I’m a bit confused as to where the 3/5 is coming from

[@mursalin5760]

here CE is 3 in this case

[@cubestuff3928]

It represent the cos / sin of the angle and whenever your side / bottom of a triangle is 3/4/5, or a multiple, you can just use the ratio rather than solve the cos or sin of the angle

[@arsalali5150]

Why did we not need to calculate the reaction forces?

[@sumaiyajerin2859]

Shouldn't F_CD = - F_DC = -800 ?