Question

Please help and show ur work!

Answer 1

Explanation:

let the missing side be "X"

Therefore :9² +x²=18²

81+x²=324

x²=324-81

x²=243

√x²=√243

x=15.6

Answer 2

15.6
18^2-9^2 will give you 243 and the square root of 243 is approximately 15.6
Using a^2+b^2=c^2