Page 149 - Start Up Mathematics_7

3. Identify which of the following pairs of angles are complementary and which are
supplementary:

(a) 30°, 60° (b) 57°, 33° (c) 111°, 69° (d) 76°, 14°

(e) 44°, 46° (f) 119°, 61° (g) 155°, 25° (h) 32°, 58°
4. Find the measure of an angle that is double its supplement.

5. Find the measure of angle x in each of the following figures:

A

(a) x 66° (b) x

B O C 55° 65°

6. In the given figure, find the measures of ∠1, ∠2 and ∠3, if ∠4 = 140°.

4

3 1
2

7. In the given figure, ∠1 = 2x – 10° and ∠2 = 3x + 20°, find x and hence ∠1 and ∠2.

A

2
1
B O C

8. Find the value of x in the following figure:

x
2 + 59°
x
4

x

Intersecting Lines l

Two lines are said to be intersecting if they have a
point in common. This common point is called the O

point of intersection. m

In the given figure, lines l and m are intersecting as they have a common point O.

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