61) Parallel line method is used in..........
a) Prism
b) Cylinder
c) Cubes
d) All of these
62) Which method of development used in surface as sphere, paraboloid, ellipsoid, hyperboloid, and helicoids
a) Radial line method
b) Triangulation method
c) Approximate method
d) Parallel line method
63) Zone method and lune method is used in development of........
a) Prisms
b) Cones
c) Sphere
d) Pyramids
64) Calculation the subtended angle Ɵ by the formula Ɵ =3600 ͓ radius of the base circle
a) Length of axis
b) Slant height
c) Radius of axis
d) None of these