Question

two straight lines intersect each other in such a way that one of the angle formed 90 degree show that each of the remaining angle measure 90 degree

Answer 1

I think both straight lines are perpendicular to each other

Answer 2

Given
Two straight lines intersect each other one angpe is 90degree
Then its vertical angle is also 90 degree (vertically opposite angle)
Now let x be the remaining one angle
90+x=180
X=180-90
X=90 degreee
Now let remaining angle be y
Y+90=180
Y=180-90
Y=90degree
Hence proved
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Hope it will help u ..