Congruence of Triangles and Inequalities in a Triangle — Maths STD 9 — Question

Fill in the blanks:
Circle having the same centre and different radii are called _________ circles.

Fill in the blanks with < or >.
(Perimenter of a triangle) (sum of its three medians)

Fill in the blanks so as to make the following statements true:
Two distinct _______ in a plane cannot have more than one point in common.

Complete the following statements by means of one of those given in brackets against each:
If one angle of a parallelogram is a right angle, then it is necessarily a _____________. (rectangle, square, rhombus).

The decimal form of an irrational number is neither ______ nor ______.

Fill in the blanks with < or >.
(Sum of three altitudes of a triangle) (sum of its three side).

Fill in the blank in the following to make the statement true:
If a transversal intersects a pair of lines in such a way that a pair of alternate angles we equal. then the lines are ______.

Fill in the blanks to make the following statements true:
A triangles cannot have more than ______ obtuse angles.

Complete the following statements by means of one of those given in brackets against each:
A line drawn from the mid-point of one side of a triangle _____________ another side intersects the third side at its mid-point. (perpendicular to parallel to, to meet).

Fill in the blank in the following to make the statement true:
If a transversal intersects a pair of lines in such a way that the sum of interior angles on the same side of transversal is 180°. Then the lines are _____ .