Quadrilaterals ...

If the angle of a quadrilateral are $${ x }^{o },(x-{ 10) }^{ o },(x+{ 30 })^{o }$$ and $$2{ x }^{ o }$$, then the greatest angle is:

The three angles of a quadrilateral are $${ 80 }^{ \circ  }$$,$${ 70 }^{ \circ  }$$and$${ 120 }^{ \circ  }$$. The fourth angle is:

Which of the following statements is false?

The angles of a quadrilateral are in the ratio $$ 1 : 2 : 3 : 4 $$ . Then the smallest angle is:

What is the maximum number of obtuse angles that a quadrilateral can have ? 

If two adjacent angles of a parallelogram are in the ratio $$ 2 : 3 $$ , then the measure of angles are:

The three angles of a quadrilateral are $$80^o,70^o$$ and $$120^o$$. Then the fourth angle is:

Area of a quadrilateral ABCD is $$20 cm^2$$ and perpendiculars on BD from opposite vertices are 1 cm and 1.5 cm. The length of BD is

Three angles of quadrilateral are $$ 47^{\circ}, 102^{\circ} $$ and $$ 111^{\circ} $$, then the fourth angle is equal to:

In a quadrilateral $$PQRS, \angle P, \angle Q, \angle R$$ and $$\angle S$$ are interior angles. If $$\angle P: \angle Q: \angle R: \angle S = 1:2:3: 4$$, then which angle is equal to $$144^\circ$$.