Tolong dijawab nomor 5, soalnya besok dikumpul.Please help me!

diketahui
AP = 15
MN= 30
BR = 10

NA = MN+AP = 30+15 = 45
NB = MN+BR = 30+10 = 40

PN =√(NA² - AP²)= √(45²-15²) = √1.800
RN = √(NB²-BR²) = √(40²-10²)= √1.500

PN : RN = √1800 : √1500 = √18 : √15 = 3√2 : √15