**Descriptive Geometry**

**Assignment A4 2020/21/1**

Given a square-based oblique prism *ABCDA*_{x}*B*_{x}*C*_{x}*D*_{x}
whose bases *ABCD* and *A*_{x}*B*_{x}*C*_{x}*D*_{x} lie on 1^{st} principle planes (on horizontal planes), furthermore, given a triangle *123. *Construct
the intersection of the prism and the triangle. Show visibility
assuming that the prism and the triangle are made from plate, and the
covering face *A*_{x}*B*_{x}*C*_{x}*D*_{x} is removed. *A*(45,
65, 155); *C*(105, 85, 155); *A*_{x}(5,
65, 235); *1*(15, 25, 190); *2*(120, 85, 175); *3*(30, 110, 245).