Question

A quadrilateral has three angle 75°and 60°and 105° find fourth angle

Answer 1

fourth angle =360°-(105+75+60)
=120°

Answer 2

as v know that sum of all angles of quad. is 360
let the unknown angle be x
so,
75+60+105+x = 360
240+ x = 360
x= 360-240
= 120
hope this help....