Teacher's Resources

15. Lines and Angles

Click the correct answer (True & False).

A plane consists of finite number of points and lines.

True

False

The distance between two parallel lines always remains the same.

True

False

The point of intersection of two lines is known as the point of concurrence.

True

False

One and only one line can pass through a point.

True

False

Four points are collinear if at least three of them lie on the same line.

True

False

Two rays having the same initial point form an angle.

True

False

Two rays form an angle if they have the same initial point.

True

False

Three or more lines which pass through a common point are known as concurrent lines.

True

False

Click the correct answer.

If the sum of the magnitudes of two adjacent angles is 180°, then what type of angle do they form?

Alternate angles

Complete angles

Complementary angles

Linear pair

What is the measure of the angles between two perpendicular lines?

90°

180°

0°

270°

The ratio between two complementary angles is 4 : 5. What are the angles?

40° and 50°

30° and 60°

38° and 52°

35° and 55°

Three angles are in the ratio 2 : 3 : 4. If their sum is 180°, what are the angles?

40°, 60° and 80°

45°, 65° and 85°

40°, 60° and 88°

50°, 62° and 84°

If one-fourth of the supplement of an angle is 15° less than its complement, what is the angle?

40°

45°

48°

50°

The sum of two adjacent angles is 95°. If one of them measures 15° less than the other, what are the angles?

55° and 40°

52° and 37°

54° and 39°

56° and 48°

Two angles are in the ratio 1 : 6. If each angle is increased by 20°, they become supplementary angles. What are the angles?

20° and 120°

22° and 125°

25° and 126°

28° and 128°

Click the correct answer.

The complement of 60° is .

30°

28°

35°

The supplement of 170° is .

10°

12°

15°

Vertically opposite angles are always .

equal

parallel

different

If the sum of two adjacent angles is 180°, then they form .

a linear pair

opposite angles

complementary angles

If one of the angles forming a linear pair is an acute angle, then the other angle is angle.

an obtuse

a straight

a reflex

The supplement of (142° + x) is .

(38° – x)

(38° + x)

(x – 38°)

Two straight lines are intersected by a transversal. If a pair of corresponding angles are equal, then the lines are lines.

parallel

intersecting

concurrent

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