A restaurant built a ramp to make their facility more accessible to people in wheelchairs. They covered the entire surface of the ramp with metal to make it more durable. \[0.1\text{ m}\] \[0.8\text{ m}\] \[0.81\text{ m}\] \[1\text{ m}\] How much metal did they use to cover the ramp, including the bottom? Give an exact answer (do not round).
