planas

In a sentence

• Las hojas de papel son planas.

  The sheets of paper are flat.

  Here, 'planas' describes the physical characteristic of 'hojas de papel' (sheets of paper) being flat, using it as an adjective.

• Las planas que escribiste en el cuaderno son muy ordenadas.

  The exercises you wrote in the notebook are very neat.

  In this sentence, 'planas' refers to written exercises for practice, commonly used in the context of learning and school.

• Las superficies planas son ideales para dibujar.

  Flat surfaces are ideal for drawing.

  Here, 'planas' describes the attribute of 'superficies' (surfaces) being flat, functioning as an adjective.