The angles 'x' and '90∘ - x' are ________.
vertically opposite angles
supplementary angles
making a linear pair
complementary angles
Adding the two angles, we get x+90∘−x=90∘ Hence, the angles 'x'and '90∘ - x' are complementary angles.
the angles of quadrilateral are 40`,70`,90` and x`.Find the x`.