1. There is a circular vegetable field with a perimeter of 1884 meters, which is widened by 4 meters around. What is the perimeter of this vegetable field now? 2. The diameter of a circular flower bed is 18 meters. A circular path with a width of 1 meter is paved around the flower bed. What is the floor area of this path

1. There is a circular vegetable field with a perimeter of 1884 meters, which is widened by 4 meters around. What is the perimeter of this vegetable field now? 2. The diameter of a circular flower bed is 18 meters. A circular path with a width of 1 meter is paved around the flower bed. What is the floor area of this path

1.C=2πr=1884
r=1884/2π=300m
300+4=304m
C=2×π×304=1909.12m
two
18÷2=9m
9+1=10m
S1=πr^2=3.14×9^2=254.34m^2
S2=3.14×10^2=314m^2
S=S2-S1=314-254.34=59.66m^2

The perimeter of a circular vegetable field is 43.96 meters. Now the perimeter is widened by 3 meters. How many meters has the perimeter increased and the area increased

Perimeter increase: 3 × 2 × 3.14 = 18.84m
43.96 ﹣ 3.14 ﹣ 2 = 7M
Area increase: 3.14 × (7 + 3) &# 178; - 3.14 × 7 & # 178; = 160.14 square meters

The perimeter of a circular vegetable field is 15.7 meters. If the perimeter is widened by 3 meters, how many meters is the perimeter and area of the vegetable field?

Radius = 15.7 ／ 2 ／ 3.14 = 2.5m
The radius is 2.5 + 3 = 5.5m after 3M widening
Perimeter C = 2 π r = 2x3.14x5.5 = 34.375 M
Area s = π R * r = 3.14x5.5x5.5 = 94.985m2
A: This is a vegetable field. Its perimeter is 34.375 meters and its area is 94.985 square meters