Question

what is mobellas theorem ??​

Answer 1

Answer:

proposition about triangles in plane geometry. Suppose we have a triangle ABC, and a transversal ...

Answer 2

Answer:

standard proof is as follows: First, the sign of the left-hand side will be negative since either all three of the ratios are negative, the case where the line DEF misses the triangle (lower diagram), or one is negative and the other two are positive, the case where DEF crosses two sides of the triangle.