Question

17. Three angles of a quadrilateral are 105°, 120° and 75° respectively.
What is the fourth angle?
(a) 50°
(b) 60°
(c) 70°
(d) 750​

Answer 1

Answer:

a+b+c+d=360(sum of all the angle of quadrilateral)

a=105

b=120

c=75

d=?

a+b+c+d=360

105+120+75+d=360

180+120+d=360

300+d=360

d=360-300

d60

Answer 2

Answer:

As we know that sum of angles of a quadrilateral is 360°

So

360°=120°+105°+75°+x

360°=300°+x

x=360°-300°=60°

So, b B is the right answer