Marinada '23

[lang=hr] Karla se kupa u bazenu savršenog kružnog oblika, baš joj je super, a nalazi se točno u sredini bazena. Na rubovima bazena su $3$ loptice - crvena, zelena i plava. Crvena i zelena loptica udaljene su za $8$, crvena i plava za $15$ i zadnje dvije za $17$. Na rubu bazena je također nestašna žabica. Koja je najkraća udaljenost Karle i žabice? [/lang] [lang=en] Karla takes a bath in a perfectly circular pool. She likes it very much since she is right in the middle of the pool. At the edge of the pool are $3$ balls - red, green and blue. The red and green balls are $8$ apart, the red and blue are $15$ apart, and the last two are $17$ apart. There is also a naughty frog at the edge of the pool. What is the shortest distance between Karla and the frog? [/lang]