Why is the area of a circle with a diameter of 10cm larger than that of a circle with a diameter of 10cm * 10cm?

Why is the area of a circle with a diameter of 10cm larger than that of a circle with a diameter of 10cm * 10cm?

That's because you miscalculated the area of the garden = 3.14 * 5 * 5 = 78.5 square meters, the area = 10 * 10 = 100