Help with Pythagorus 3D maths homework really fast please!!!!!!
Awarding brainliest

Answer:
x = 20 / √3 = 20√3 / 3
Step-by-step explanation:
AC² = AD² + BC² = x² + x² = 2 x²
AF² = AC² + CF² = 2 x² + x² = 3 x²
3 x² = 20² = 400
x² = 400/3
x = 20 / √3 = 20√3 / 3