Respuesta :

1) In small triangle
hypotenuse =adjacent leg/cos (45⁰) = 10√2 / (√2/2)=20

2) In large triangle
x is a hypotenuse,
leg = 20 is an adjacent leg to the angle 60⁰.

hypotenuse =adjacent leg/cos (60⁰) =20 / (1/2) = 20*2 = 40

Answer B. 40