Question

WHEN A CIRCULAR PLANE ROTATED TO 30 DEGREE HOW IT WILL LOOK IN ITS FRONT VIEW( SURFACE PARALLEL TO vp) *

Answer 1

The projection of the circular plane is shown in figure.
To understand , Let's first assume that the plane is perpendicular to HP( horizontal plane ) and parallel to VP (vertical plane). The front view will be a circle and with diameter equal to diameter of plane(lamina). now Let's divide the circle into 12 equal parts such as 1', 2', 3',... 12'. The top view will be straight line 1-7, parallel to XY line ( see figure) and can be obtained by drawing projectors, 1, 2, 3.... 12.

since the circle inclined at 30° to vertical plane (VP) and perpendicular to horizontal plane (HP) reconstruct the top view such that straight line inclined at 30° to XY line. Let the respective points are $1_1',2_1',3_1'......12_1'$. draw vertical projectors from the points $1_1',2_1',3_1'......12_1'$ to meet the horizontal projectors to obtain the points $1_1',2_1',3_1'......12_1'$ in the front of view of the circular plane.