UNDERSTANDING QUADRILATERALS CLASS VIII

The angles of a quadrilateral are in the ratio 1 : 2 : 3 : 4. The smallest angle is

• (a) 72°

• (b) 144°

• (c) 36°

• (d) 18°

Find the value of x in the trapezium ABCD given below.

• 50⁰

• 60⁰

• 70⁰

• 80⁰

• a

• b

• c

• d

• a

• b

• c

• d

Find the values of x and y in the following parallelogram.

• 20⁰

• 30⁰

• 40⁰

• 50⁰

Which of the following is true for the adjacent angles of a parallelogram?

• (i) they are equal to each other

• (ii) they are complementary angles

• (iii) they are supplementary angles

• (iv) none of these

If two adjacent angles of a parallelogram are (5x – 5) and (10x + 35), then the ratio of these angles is

• (a) 1 : 3

• (b) 2 : 3

• (c) 1 : 4

• (d) 1 : 2

ABCD is a parallelogram. Find the values of x, y and z.

• 80⁰,70⁰,30⁰

• 80⁰,40⁰,50⁰

• 100⁰,70⁰,40⁰

• 60⁰,70⁰,30⁰

What is the sum of all the angles of a pentagon?

• (a) 180°

• (b) 360°

• (c) 540°

• (d) 720°

Find the value of x

• 140⁰

• 100⁰

• 60⁰

• 80⁰