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45mm

Step-by-step explanation:

Pythagoras theory

a²=b²+c²

a=hypotenus=75

b=opposite =a

c=adjacent =60

Apply Pythagoras theroem

a²=b²+ç²

make b subject of formula ,carry a² over the equality sign

b²=c²-a²

replace alphabets with their values

b²=75²-60²

b²= 2025

b= square root of 2025

b=45

I'm assuming 2, 3, 10, 12, and 13? that's confusing