Answer: p:a
Explanation:
Triangle ABC is similar to triangle PQR. In similar triangles sides are in proportion.The side opposite to equal angles are in proportion.
r is opposite to <R and c is opposite to <C in figure .These angles C and R are marked equal in the triangles.So the sides are in proportion .Among the given options p and a sides are opposite to the equal angles <P and <A.so they will be in proportion.
r:c=p:a.