Triangle abc is similar to triangle pqr, as shown below: two similar triangles abc and pqr are shown. triangle abc has sides ab = c, bc = a, and ac = b. triangle pqr has sides pq = r, qr = p, and pr = q. angle cab is congruent to angle rpq. angle abc is congruent to angle rqp. angle acb is congruent to angle qrp. which ratio is equal to b: q? b: a c: r r: a q: c