|The angles in a triangle are in the ratio 1:1:4 |(a) Find the size of the largest angle?
b) what type of triangle is it?

Since the internal angle sum of a triangle is 180 degrees, and the angles are in ratio if 1:1:4, the angles with that's corresponding to the 1 will have value of 180/6=30 degrees.

The largest angle will have value 30*4=120 degrees.

This is an obtuse triangle because largest angle>90 degrees.