Write the following statements in conditional form.

(i) Every rhombus is a square.

(ii) Angles in a linear pair are supplementary.

(iii) A triangle is a figure formed by three segments.

(iv) A number having only two divisors is called a prime number.

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Solution

(i) If the given quadrilateral is a square, then it must be a rhombus.
(ii) If the given two angles are forming a linear pair, then they are supplementary.
(iii) If the given figure is a triangle, then it is formed by three segments.
(iv) If the given number is having only two divisors, then it is a prime number.

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Q. Fill in the blanks:
(i) A polygon is a simple closed figure formed by more than ...... line segments.
(ii) A polygon formed by three line segments is called a ....... .
(iii) A polygon formed by four line segments is called a ...... .
(iv) A triangle has ...... sides and ...... angles.
(v) A quadrilateral has ...... sides and ...... angles.
(vi) A figure which ends at the starting point is called a .......... .

Which of the following statements are true., (T) and which are false (F)?

(i) Angles forming a linear pair are supplementary.
(ii) If two adjacent angles are equal, then each angle measures $90^{\circ}$ .
(iii) Angles forming a linear pair can both be acute angles.
(iv) If angles forming a linear pair are equal, then each of these angles is of measure $90^{\circ}$ .