Which relationship is always correct for the angles p, q, and r of triangle abc?

p + r = q
p + q + r = 180 degrees
p + q + r = 90 degrees
q + r = p

The correct answer is q + r = p.

The reason that we know this is that we know all the interior angles will add up to 180. We also know the angle opposite to p (let's call it s) will be equal to 180 - p since together they create a straight line. So, we can set up this equation and solve using that substitutation.

q + r + s = 180 ---> Sub in p value

q + r + (180 - p) = 180 > Subtract 180 from both sides

q + r - p = 0 > Add p to both sides

q + r = p

squares, rhombus, rectangles

i think the answer is b