a circular field is to be fenced having it turns of wire 3520 wire is required for this purpose find the radius of field and its area in ares
Answers
Answered by
2
Circumference =2πr=3520×7÷2×22=
560m radius
Answered by
1
Answer: 25
Step-by-step explanation:
This is a very simple question. Let M be the angle, the arc of the sector AOB makes with the center O. Let OA = OB = radius r.
Given
OA+arcAB+OB=20
2r+rM=20
M=20−2rr
Area A of the sector =M2r2=10r−r2
dAdr=10−2r=0
r=5
Second derivative is negative for r=5
We get maximum area at r=5
A=25
laukikwaikar:
wrong way
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