RS Aggarwal Class 6 Math Seventeenth Chapter Quadrilaterals Exercise 17B Solution

EXERCISE 17B

(1) The sum of all the angles of a quadrilateral is

Ans: (c) 360^o

(2) The three angles of a quadrilateral are 80^o, 70^o and 120^o. The fourth angle is

Ans: (c) 90^o

Solution: We know that the sum of all angles of a quadrilateral is 360^o

So, 360 – (80+70+120) = 360 – 270 = 90^o

(3) The angles of a quadrilateral are in the ratio 3 : 4 : 5 : 6. The largest of these angles is

Ans: (c) 120^o

Solution: We know that the sum of all angles of a quadrilateral is 360^o

(4) A quadrilateral having one and only one pair of parallel is called

Ans: (d) A trapezium

(5) A quadrilateral whose opposite sides are parallel is called

Ans: (d) A parallelogram

(6) An isosceles trapezium has

Ans: (b) Equal nonparallel sides

(7) If the diagonals of a quadrilateral bisect each other at right angles, then this quadrilateral is

Ans: (b) A rhombus

(8) A square is

Ans: (b) All sides equal and diagonals equal

(9) A quadrilateral having two pairs of equal adjacent sides but unequal opposite sides, is called a

Ans: (c) Kite

(10) What do you mean by a regular quadrilateral?

Ans: (c) A square