Question

can someone help please .

Answer 1

a is equal to 8
using Pythagoras theorem
100=36+x^2
64=x^2
x=8
(length cannot be negative)

Answer 2

You can do it by pythagoras theorem
$(ab) {}^{2} + (bc) {}^{2} = (ca) {}^{2}$
Now transfer the formula and put the value