Page 160 - Start Up Mathematics_7

5. In each of the following figures, state with reason whether l is parallel to m or not?

m m
n l n l
l 57° l 72° n
(a) 126° (b) 75° n (c) 123° (d)
44° m m 98°
75°

6. In the given figure, AB || CD. ∠ABE = 120°, ∠ECD = 95°. Find the value of x.

C
D
B 95°
A
120°
x

E
D C

7. In the given figure, ABCD is a parallelogram. Prove that
∠ADC = ∠ABC.

A B

Thinking Skills

1. Two lines when cut by a transversal forms a pair of equal corresponding angles. What can
be said about pairs of alternate interior angles?
2. Find the value of the unknown angle in each of the following figures:

290°
45°

x 58° y
(a) (b) 20°

60°

3. In the following figures, find the values of x and y.

130°

(a) y 120° (b) x 70°
y
x
40°

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