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 1 of 3.
Manali Chowdhury said:
8 years ago
In the triangle one is 90° angle, and the same another angle of 40° in the same direction is also a 40° angle because it is placed on the same line.
So, the other angle is θ.
So, as we know the hole angle of a triangle is 180°.
Therefore, solution,
40° + θ +90° = 180°.
Or, θ + 90° = 180° - 40°.
Or, θ + 90° = 140°.
Or, θ= 140° - 90°.
Or, θ = 50°.
So, the angle θ is 50°.
Thanking you.
So, the other angle is θ.
So, as we know the hole angle of a triangle is 180°.
Therefore, solution,
40° + θ +90° = 180°.
Or, θ + 90° = 180° - 40°.
Or, θ + 90° = 140°.
Or, θ= 140° - 90°.
Or, θ = 50°.
So, the angle θ is 50°.
Thanking you.
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 ?
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.
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.
Lakshmi said:
1 decade ago
In 1st figure:
The two lines are parallel hence it is 40.
Since it is a straight line it makes 180.
Hence 180-40 = 140.
Theta = 140-90 = 50.
Same in the second and third figure.
The two lines are parallel hence it is 40.
Since it is a straight line it makes 180.
Hence 180-40 = 140.
Theta = 140-90 = 50.
Same in the second and third figure.
Udayan singh said:
1 decade ago
In fig1- if unmentiond angle is90 then theta =5:
fig2: theta+90+40=ans.
Fig3: the angle besides the 40 must b a rit angle then theta =501
net ans for theta in thrice case to b 50.
fig2: theta+90+40=ans.
Fig3: the angle besides the 40 must b a rit angle then theta =501
net ans for theta in thrice case to b 50.
Karthik said:
1 decade ago
IN fig1 consider triangle ABC the angle A was 40 B was 90 then C WAS 50 now we draw perpendicular line to B 90 - 50=40 incliantion line angle 40 so 90 -40=50=theata.
Desingu said:
1 decade ago
In third figure, if you just remove the 40 degree line (only imagination)you can see right angle triangle, so that 90-40=50 degree. As per the rules is 50 degree
THIRUPATHAIAH said:
1 decade ago
40 degrees is given vertically according to alternative angle beside the theta angle is 40 degrees we know that t+40=90 then t=50 degrees where t is theta
Brahmananda Reddy said:
1 decade ago
In third fig we have an ang bisector. So we get 40 again. Ang bisector divides 80 into 40 each. So from alternate angles principle we will get ans as 40.
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