Question

In adjacent figure, lues xy and low intersent oto'. Te for 90 and a: 1-2:3 Ao find a FM HE TEM ta ORAS bang​

Answer 1

Answer:

according to the laws of reflection, angle of incidence = angle of reflection

so, let each of them be x units

thus

x+90°+x=180°

as it is plane surface

2x+90°=180°

2x=180°-90°

2x=90°

x=90°÷2

x=45°

thus angle of incidence and angle of reflection are each of 45°

Answer 2

Answer:

In the given figure,

∠POY=90

∘

∠POX+∠POY=180

∘

( Linear pair )

∠POX+90

∘

=180

∘

⇒∠POX=90

∘

a:b=2:3

Let a=2x

∘

and b=3x

∘

∠POX=a+b=5x

90

∘

=5x

⇒x=18

∘

∠MOX=b=3x=54

∘

∠MOX+∠NOX=180

∘

( Linear pair)

b+c=180

∘

54

∘

+c=180

∘

c=180

∘

−54

∘

=126