Spread 2 meters on both sides, plus 0.8 on the bottom, it is ***4.8 meters.
2. When the depth is also 2 meters,
The inclination angle α satisfies: tan α = 2 ÷ [(1.5-0.8) ÷ 2] ≈ 5.7, which is the slope.
The inclination angle α ≈ 80.