Question

If any one out there knows how to do this please tell me

Answer 1

Answer: 17.32 or 17

Step-by-step explanation:

Using Pythagoras theorem

20^2=10^2+b^2

20^2 - 10^2=b^2

300=b^2

Taking square root on both sides

√300=b

b=17.32

Answer 2

Answer:

17.32

Step-by-step explanation:

x² + 10² = 20²

x² + 100 = 400

x² = 400 - 100

x² = 300

x = √300

x = 17.32