Question

1.- A circle has a radius of 10cm. what is its area?

2.- A circle has a diameter of 18cm. what is it's area?

Answer 1

1.- the area of the circle it's 314cm²
2.- the area of the circle it's 254,34cm²

Answer 2

area = radio² * π
area = (10cm)² * π
area = 100cm² * 3,14
area = 314 cm²

radium = 18cm : 2
radium= 9cm
area = (9cm)² * 3,14
area = 81cm² * 3,14
area = 254,34 cm²

saludos