Complete the following statements.

 In a protractor, the mid-point of the ______ is called the centre of the protractor.

Complete the following statements.

Two lines are said to be _____ if they intersect such that the angles formed between them are right angles.

Draw a line segment $AB = 10.2 cm$. Draw its perpendicular bisector using a pair of compasses. Let this bisector $XY$ meet $AB$ at $C$. Fill in the following blank:

$AC=$_____ $cm$

Draw a line segment $AB = 10.2 cm$. Draw its perpendicular bisector using a pair of compasses. Let this bisector $XY$ meet $AB$ at $C$. Fill in the following blank:

$BC=$_____ $cm$

Draw a line segment $AB = 10.2 cm$. Draw its perpendicular bisector using a pair of compasses. Let this bisector $XY$ meet $AB$ at $C$. Fill in the following blank:

$\angle ACX=$_____ 

Draw a line segment $PQ$. Draw its perpendicular bisector $XY$. Mark a point $C$ on $XY$ which is outside $PQ$. Join $PC$ and $CQ$. Measure $\angle PCQ$. Take another point $D$ on $XY$. Join $PD$ and $DQ$. Measure $\angle PDQ$. Are $\angle PCQ$ and $\angle PDQ$ equal?

Draw an angle $\angle AOB$ such that $OA = OB$. Draw perpendicular bisectors of $OA$ and $OB$. Let the perpendicular bisectors of $OA$ and $OB$ intersect at $P$. Measure $AP$ and $BP$. Is $AP= BP$?

Draw a circle with radius $OA = 3.6 cm$. Take a point $B$ on the circle. Draw a diameter through $B$ such that it meets circle at $C$. Measure $BC$.  Is $OA =\frac{1}{2}BC$?

Draw a circle with radius of $2.5 cm$. Draw its diameter also. Measure the diameter.