A sphere of 70mm diameter rests on HP. It is cut by a section plane inclined at 45° to HP and perpendicular to VP, passing through the center. Draw the sectional front view and true shape of section.

Draw the sphere in front and top views
Show the cutting plane in front view at 45° through center
The section of a sphere is always a circle
Calculate the diameter of the sectional circle
Draw the sectional front view showing the cut surface
The true shape is a circle with calculated diameter