Question

please ANSWER all the questions
and i will mark you brainliest but it should be right​

Answer 1

Step-by-step explanation:

Ques 11 Answer (i)

l parallel to m, c = 120° [Alternate interior Angles]

Angle a + 40° + 120° = 180°

[Angle sum property of a ∆]

Angle a = 180 - ( 120+40)

= 180 - 160

= 20°

<a + <b + <c = 180° {m is a straight line}

<b = 180° - (<a - <c)

= 180 - (20 + 120)

= 180 - 140

= 40°

(ii) <a = 45° [Alternate interior Angles]

<c = 55° [Alternate interior Angles]

<a + <b <c = 180° ( straight line )

<b = 180 - (<c + <a)

= 180 - (45+55)

= 180 - 100

= 80°