Which shape has clear corners and straight sides?

Correct answer: Square

The direct answer is C, square. A square is a geometric shape with four straight sides, four clear corners, and four equal sides. Step by step: check whether the boundary is straight; count the corners; see whether there are four sides; confirm that the sides are equal and the corners are right angles. A square meets all these features. Option C is correct because it has clear corners and straight sides. Option A, circle, has a curved boundary and no corners. Option B, cloud, usually has an irregular, soft, curved outline and is not a precise geometric shape. Option D, smoke, has a changing, uneven, curved form and does not have fixed straight sides or corners. A rectangle also has straight sides and corners, but the listed correct shape is the square. Do not confuse a square with a general four-sided figure: a square has equal sides as well as four corners. Memory cue: square means four straight equal sides and four corners.