Radius: The radius of the great circle with R is small.
Diameter: the diameter of the big circle and the small circle D-
Circumference:
Region: s
Basis: R =? DD = 2R
c = 4A S = 2。
C length =(A+B)×2 S length = AB.
Category S = AH S3 = AH÷2
Step =(A+B)H÷2
Whole circumference:
C = π d = 2π rd = c ÷ pi
r = c÷pi÷2 = c÷2π= c÷6.28
Semicircular perimeter:
Half =πD2 \u+ D
=(PI÷2)D + D× 1
= 1.57d + D
= 2.57d BR p & gtC half =2πR÷2 +2
= Sunday +2
= 5. 14r
D = C half ÷2.57
R = half/5.14
Half the circumference:
c? =πD÷2
? =2πR÷2 = NR
D =? ×2π
R = C? circumference ratio
Cycle length
CN = nπd = 2nπr
............
We should consider the relationship between distance, time, speed and surrounding areas, and the conditions and requirements of tourism.
Distance = speed × time
Rotational speed = distance ÷ time
Time = distance/speed
Journey = one week.
C = speed × time
Rotational speed = C÷ time
Time = C÷ speed
The whole area? A circle
s = NR ^ 2 = pi(d÷2)2
Semicircular area:
Half = NR 2 ÷ 2 = (π 2) R 2 = 1.57R2。
Annular area:
Ring -s = s = π R2 π R2 = π (R 2-R 2)
Semi-annular area:
In S semiring = S ring ÷ 2 = π (r 2-r 2) ÷ 2 =1.57 (r 2-r 2).
Perimeter and area of playground:
1, middle rectangle:
Transportation = C round +2
Small OP = S+S cycle length
2. Intermediate party:
Yun C = C wheel +2 D
S OP = S circle +S front