Respuesta :

Answer:

A ≈ 1385.4 cm²

Step-by-step explanation:

The area (A) of a circle is calculated as

A = πr² ( r is the radius )

  = π × 21²

 = π × 441

 = 441π cm²

 ≈ 1385.4 cm² ( to 1 dec. place )