Question

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Answer 1

Answer:

b=40(alternate angles)

c=180-60(angles on straight line)

c=120

Answer 2

Answer:

a=20°

b=40°

c=120°

Step-by-step explanation:

Sum of all the angles of a triangle is 180°

So, 120°+40°+a=180°

a+160°=180°

a= 180°-160°

a=20°

Since L||M, so Alternate Interior Angles are equal.

b=40° (Alternate Interior Angles)

a+b+c= 180° (Linear Pair of Angles)

20°+40°+c=180°

c+60°=180°

c= 180°-60°

c= 120°

{ Note that 'c' can also be found by using the property of Alternate Interior Angles as L||M

c=120° [Alternate Interior Angles are equal]}