Engineering Mechanics - General Principles - Discussion
Discussion Forum : General Principles - General Questions (Q.No. 3)
3.
Determine the angle
: = 30° = 40° = 60° = 50°Discussion:
30 comments Page 3 of 3.
M.prakash said:
1 decade ago
How please explain?
Neeraja said:
1 decade ago
In the second fig since alternate angles are equal
40=90-theta
then theta=90-40
=50
40=90-theta
then theta=90-40
=50
Jatinder singh tumber said:
1 decade ago
Now look at first figure the line of 40 and theta are parallel and the common line of 40 and theta i.e. from right side of theta to right side of 40 is angle of 90, so left side of theta is anle of 40 so 90 - 40 =50.
Manpreet said:
1 decade ago
The answer is in the third diagram..when the perpendicular line of 40 angle extends towards upper side then it clearly shows that angles should be 40 & 50..so thita will be 50 because of angle is made at same line.
Yuvaraj said:
1 decade ago
Look at the 3rd fig.
Extend that 40degree line to opposite direction, then the right portion of that 4 0degree line can be written as,
40+x+40=180 so x=100 which is vertically opposite to one of the angle in the
Triangle, so the total angle in the triangle is
θ+100+y=180,
So θ+y=180
But why is vertically opposite to the angle 40 hence θ=40 ?
Extend that 40degree line to opposite direction, then the right portion of that 4 0degree line can be written as,
40+x+40=180 so x=100 which is vertically opposite to one of the angle in the
Triangle, so the total angle in the triangle is
θ+100+y=180,
So θ+y=180
But why is vertically opposite to the angle 40 hence θ=40 ?
Naga chaitanya said:
1 decade ago
Anish kur's explanation to second diagram is correct.
Karthik said:
1 decade ago
Could'nt understand.
Prasad said:
1 decade ago
The first figure, I guess is wrong. The other angle other than 40 degree and theta is supposed to be perpendicular. It is moreover confusing.
Sd afzal said:
1 decade ago
How please explain?
Anish kur said:
1 decade ago
In fig 2 ,considering the alternate angles we get
40+x+90=180
x=50,where x=theta(required angle)
40+x+90=180
x=50,where x=theta(required angle)
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