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

Draw a liner pair of angles. Bisect each of the two angles. Verify that the two bisecting rays are perpendicular to each other.

Draw a linear pair of angles. Bisect each of the two angles. Verify that the two bisecting rays are perpendicular to each other.

Draw an obtuse angle. Bisect it. Measure each of the angles so obtained.

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 areacute angles, then the other pair of vertically opposite angles are __________.

Show that the line y= x bisects angle Xoy.

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

Indicate which pairs of angles are:(i) Vertically opposite angles. (ii) Linear pairs.

Two lines AB and CD are cut by a transversal EF, as shown in the figure. Identify the given pair of angles as adjacent angles, vertically opposite angles, alternate angles, corresponding angles or co-interior angles angle3 and angle4

Two lines AB and CD are cut by a transversal EF, as shown in the figure. Identify the given pair of angles as adjacent angles, vertically opposite angles, alternate angles, corresponding angles or co-interior angles angle4 and angle5