This has 6 surface areas ok zzmznznznznzjjznznsnjsowowokwkwnendmdmdmdm
If it’s a negative slope A, if it’s a positive slope B
Use trigonometry.
tan30° = perpendicular / base
Here for angle 30° , x is perpendicular while 10 is the base.
tan30° = 1/√3
1/√3 = x/10
x = 10/✓3
By rationalising
x = 10√3/3
Hope This Helps You!