Question

Determine the work angle 30 degree

Answer 1

So, to construct an angle of 30º, first construct a 60º angle and then bisect it. Often, we apply the following steps.

Step 1: Draw the arm PQ.

Step 2: Place the point of the compass at P and draw an arc that passes through Q.

Step 3: Place the point of the compass at Q and draw an arc that cuts the arc drawn in Step 2 at R.

Step 4: With the point of the compass still at Q, draw an arc near T as shown.

Step 5: With the point of the compass at R, draw an arc to cut the arc drawn in Step 4 at T.

Step 6: Join T to P. The angle QPT is 30º.

Answer 2

Work done on a body when the body moves at an angle to the direction  of force applied.W=Fx d cosθwhere F is forced is displace,and θ is the angle between  F and d.

Given that θ is 30°
Workdone =W=Fxd Cos30°
=Fxd √3/2

Hope it helps.....