Quadrilaterals ...

In the adjoining figure, if $$\angle A  =90^o$$, then find $$x$$.

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

In a quadrilateral $$ABCD$$, $$\angle{A}+\angle{C}$$ is $$2$$ times of $$\angle{B}+\angle{D}$$. If $$\angle {D}={40}^{o}$$, then $$\angle {B}=$$ _____.

Read the following statement and choose the correct alternative from those given below them:
(i) Diagonals of a rectangle are perpendicular bisectors of each other 
(ii) Diagonals of a rhombus are perpendicular bisectors of each other 
(iii) Diagonals of a parallelogram are perpendicular bisectors of each other 

The line $$3x+2y=6$$ will divide the quadrilateral formed by the lines $$x+y=5,y-2x=8,3xy+2x=0$$ and $$4y-x=0$$ in 

$$A B C D$$ is a quadrilateral. If $$\angle A C B = \angle A D B ,$$ then $$A B C D$$ is

X, Y are the mid-points of opposite sides AB and DC respectively of a parallelogram ABCD. AY and DX are intersecting at S; CX and BY are intersecting at R. Then SXRY is a_____________.

If the angles of quadrilateral are $$x,x+20,2x+45,x+15$$. Find $$x$$.

In a quadrilateral $$ABCD,\angle A = 2x - {35^ \circ },\angle B = 3x - {5^ \circ },\angle C = x + {10^ \circ },\angle D = 4x + {20^ \circ },$$ find the value of $$x$$,

The angles of quadrilateral are $$30,150,60$$ find the third angle