Answer:
60 would be the angle correlated to the question
2 pairs of congruent sides
YES!
You know it like this:
if something (x)is 1/10 of a whole(y), then you need 10 of this for the whole (y).
So the whole is then:
y=x*10
if x=40:
y=40*10=400,,
so yes, 40 is 1/10 of 400.
