If A,B,C,D are the angles of quadrilateral, then find `(sum tan A)/(sum cot A).`

Statement I: If A,B,C,D are angles of a cyclic quadrilateral then sum sin A=0. Statement II: If A, B, C, D are angles of cyclic quadrilateral then sum cos A=0.

If A, B, C, D be the angles of a cyclic quadrilateral, taken in order, prove that : cos A + cos B + cos C+ cos D = 0 .

If a,b,c,d are the side of a quadrilateral, then find the the minimum value of (a^(2)+b^(2)+c^(2))/(d ^(2))

If A,B,C and D are angles of quadrilateral and sin(A)/(2)sin(B)/(2)sin(C)/(2)sin(D)/(2)=(1)/(16) , prove that A=B=C=D=pi/2

Sum of the four angles of a quadrilateral is the four right angles.

Sum of the angles of a quadrilateral is ................ .

If the degree measures of the angles of quadrilateral are 4x,7x,9x and 10x what is the sum of the measures of the smallest angle are largest angle?

Sum of all the interior angles of a quadrilateral is 180^(@) ?.