AHSME 1999 Problem 16

What is the radius of a circle inscribed in a rhombus with diagonals of length $10$ and $24$? $\mathrm{(A) \ }4 \mathrm{(B) \ }\frac {58}{13} \mathrm{(C) \ }\frac{60}{13} \mathrm{(D) \ }5 \mathrm{(E) \ }6$