...square is a congruent square. Theorem 28 448. The acute angle which a line makes with its projection on a plane is the least angle which it makes with any line drawn in the plane through its -foot. B Given the line AB, and AC its projection on the plane M. Let...

...SOLID GEOMETRY. JUNE, 1907. 1. What is meant by the projection of a line on a given pinne? Show that the acute angle which a straight line makes with its...plane is the least angle which it makes with any line in that plane. 2. State and prove the theorem concerning the lateral area of a regular pyramid. What...

...equally distant from M, prove that B, Y, and Q are also. PART II. ADVANCED SOLID GEOMETRY 5. Prove that the acute angle which a straight line makes with its own projection on a plane is the least angle which it makes with any line of the plane. 6. Prove that the lateral...