If the diameter of a circle increases by 1 / 10, how many parts of its area will it increase? Why

If the diameter of a circle increases by 1 / 10, how many parts of its area will it increase? Why

S = π R & # 178; = π D & # 178 / 4 now it's right to add 1 / 10s = π (1 / 10) &# 178 / 4 = 7.85 × 10 (negative cubic) to the diameter, because if the diameter increases by 1 / 10, the radius also increases by 1 / 10

If the radius of a circle increases by one-third, how many points does the area of the circle increase!

(1 + 1 / 3) × (1 + 1 / 3) - 1
= 4 / 3 × 4-1 / 3
= 16-1 / 9
= 7 / 9

The circumference of a circle increases by a quarter, and the area of the circle increases by a few tenths

Radius ratio 4:5
Area increase (25-16) / 16 = 9 / 16

If the radius of a circle increases by 1 / 3, the area of the circle increases by several parts

7/9