19. Five marks exercise problem V

A trianglular shaped glass with vertices at \(A(-5, -4)\), \((B(1,6)\) and \(C(7,-4)\) has to be painted. If one can of paint covers \(6 \ square \ feet\), how many cans of paint will be required to paint the whole glass, if only one coat of paint is applied?

 

Answer:

 

The cans required to paint the whole glass \(=\) .