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Could anyone help me understand the steps on the below questions?

A cone has a total surface area of 300π cm² and a radius of 10 cm. What is its slant height?

A cone has a slant height of 20 cm and a curved surface area of 330 cm2. What is the circumference of its base?

I'd really like to know what steps I need to take to get to the answer on these.

Thank you in advance