The slope is 1, that is, the slope angle is 45. If it is increased by 2 meters, it will naturally extend outward by 2 meters.

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.