Question

pls solve the question sum no 10​

Answer 1

Answer:

Lc = 70° (alternate interior angle)

La=Lc. (corresponding angle)

La=70°

Ld=70° (vertically opposite angle)

Lb=Ld (corresponding angle)

Lb=70°

L this is the sign of angle

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Answer 2

From the figure(9.42),we understand that m and n are transversal passing through parallel lines PQ and RS.

To find:a,b,c and d.

Required answer

From the figure:-

d = 70°(vertically opp. Angles)

d = c (corresponding angles)

c = a (corresponding angles )

a = b ( corresponding angles )

Hence, a=b=c=d=70°

$\large\rm\underline{\color{maroon}{Must~know :)}}$

When a transversal intersects two parallel lines,

• The corresponding angles are equal.

• The vertically opposite angles are equal.

• The alternate interior angles are equal.

• The pair of interior angles on the same side of the transversal is supplementary.