Which term describes an airfoil having the same shape on the top and the bottom?

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Multiple Choice

Which term describes an airfoil having the same shape on the top and the bottom?

Explanation:
A symmetrical foil has identical shapes on the top and bottom, giving zero camber. With no curvature to create lift by itself, the lift produced comes mainly from the angle of attack, and the airfoil behaves the same for positive and negative angles. The other options describe foils with some curvature (cambered), partial symmetry (semi-symmetrical), or no curved profile at all (flat plate), so they do not match the idea of identical top and bottom surfaces.

A symmetrical foil has identical shapes on the top and bottom, giving zero camber. With no curvature to create lift by itself, the lift produced comes mainly from the angle of attack, and the airfoil behaves the same for positive and negative angles. The other options describe foils with some curvature (cambered), partial symmetry (semi-symmetrical), or no curved profile at all (flat plate), so they do not match the idea of identical top and bottom surfaces.

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