Question

In figure in 11 lines l and m intersect each other at a point. which of the following is not always true?
a) angle a =angle b
b) angle c = angle d
c) angle a + angle d = 180°
d) angle a + angle b =90°​

Answer 1

Answer:

the correct answer is d

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

From the given figure:-

a)angle a= angle b it's true

Reason:-

vertically opposite angles

b)angle c=angle d it's true

Reason:-

Vertically opposite angles

c)angle a+angle d=180° it's true

Reason:-

Linear pair

d)angle a +angle b=90° it's not true

Reason :-

we can't say because given angles are vertically opposite angles.

if one of the angles is given then we find all other angles.