Answer:
A) 10[tex]\sqrt{2}[/tex]
Step-by-step explanation:
this is an isosceles triangle because it has 2 equal sides
it is also a 45-45-90° triangle because the right angle measures 90° so the sum of the other two equal angles must be 90°; therefore each base angle measures 45°
the sides of a 45-45-90° triangle, respectively, have a ratio of 1 to [tex]\sqrt{2}[/tex]
so if the legs are 10 then 'x' must be 10[tex]\sqrt{2}[/tex]
