Question

20 m of wire is available for fencing off a flower bed in the form of a circular sector of radius 5 m then the maximum area (sq.m) of the flower bed is?​

Answer 1

Answer:

78.5 m^2

Step-by-step explanation:

radius(r) = 5m

Area of the flower bed = π r^2

= 3.14 × 5^2

= 3.14 × 25

= 78.5 m^2

Answer 2

Answer:

Step-by-step explanation:

let m be the theta

Total length=r+r+rm=20

M=(20-2r)÷r

Area=1/2×r^2m=1/2r^2[(20-2r)÷r]

=10r-r^2

dA÷dr=0

10-2r=0

r=5

Area=50-25=25