Answer:
B = 180 - 130 - 25 = 25
a = 6
c = 10.9
Step-by-step explanation:
the sum of all angles in a triangle is always 180 degrees.
so, we know 2 angles. we need to subtract them from 180 to get the third angle.
as it turns out, the angles at A and B are equal, and that means that also the corresponding side lengths must be equal : a = b = 6.
and for c we use the general Pythagoras
c² = a² + b² - 2ab×cos(C)
c² = 36 + 36 - 72×cos(130) = 118.28...
c = sqrt(118.28...) = 10.87569344... ≈ 10.9
just in case
36 + 36 - 72×cos(130) = 72 - 72×-0.64... =
= 72 + 72×0.64... = 118.28...
