Page 161 - Start Up Mathematics_7

4. Answer the following questions:

80° l
(a) Why is ∠4 not equal to ∠8? 1 2
3 4
(b) List all angles whose measure is 80°.

65°
(c) List all angles whose measure is 100°. 5 6
7 8 m
(d) Name two pairs of alternate interior angles having
the same measure and two pairs of alternate interior 10 n
9
angles not having the same measure. 11 12

p
Some NCERT Textbook Questions

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

(a) 65°, 115° (b) 63°, 27° (c) 112°, 68° (d) 130°, 50°
(e) 45°, 45° (f) 80°, 10°
2. Find the angle which is equal to its complement.

3. Find the angle which is equal to its supplement.
1

4. In the following figure, is ∠1 adjacent to ∠2? Give reason.

2

p q
5. In the adjoining figure, p || q. Find the unknown angles. e

125° f a b
d c

6. In the given figure, the arms of two angles are parallel. A

If ∠ABC = 70°, then find D
(a) ∠DGC
(b) ∠DEF 70° C
B
G
E
F
Exemplar Problems

1. The angles between North and West and South and East are:

(a) complementary (b) supplementary

(c) both are acute (d) both are obtuse

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