Draw a pair of vertically opposite angles. Bisect each of the two angles. Verify that the bisecting rays are in the same line.

The sum of two vertically opposite angles is 166^(@) . Find each of the angles.

Draw lines PQ and RS intersecting at point O. Measure a pair of vertically opposite angles. Bisect them. Are the bisecting rays forming a straight line ?

Prove that the bisectors of a pair of vertically opposite angles are in the same straight line.

Fill in the blanks: (i) If two angles are complementary, then the sum of their measures is _______. (ii) If two angles are supplementary, then the sum of their measures is ______. (iii) Two angles forming a linear pair are _______________. (iv) If two adjacent angles are supplementary, they form a ___________. (v) If two lines intersect at a point, then the vertically opposite angles are always _____________. (vi) If two lines intersect at a point, and if one pair of vertically opposite angles are acute angles, then the other pair of vertically opposite angles are __________.

Bisect angle XYZ

If diagonal of a quadrilateral bisects each other at right angles then it is a

If the bisector of the vertical angle of a triangle bisects the bese of the triangle;then the triangle is iscsceless.

Show that the diagonals of a rhombus bisect each other at right angles.

In which quadrilateral diagonals bisect each other at right angles?