Please help me with this

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C = 40°c ≈ 5.79a ≈ 6.89

Step-by-step explanation:

The acute angles in a right triangle are complementary, so ...

  C = 90° -50°

  C = 40°

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SOH CAH TOA reminds you of the relations ...

  Cos = Adjacent/Hypotensue

  Sin = Opposite/Hypotenuse

Then ...

  cos(50°) = c/9

  c = 9·cos(50°) ≈ 5.79

  sin(50°) = a/9

  a = 9·sin(50°) ≈ 6.89

I think the correct answer from the choices listed above is option D. The most precise name for the space with the properties given that there is a lateral surface and two circular bases would be a cylinder. A cylinder is a 3D figure with two circle bases parallel to each other connected by a curved surface.