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Alona [7]
2 years ago
11

Pls helo me with this pls

Mathematics
1 answer:
Trava [24]2 years ago
7 0

Circumference of a circle = 2πr

where, r = radius

Given, diameter, d = 7 cm

radius, r = diameter/2

= d/2

Circumference of the circle = 2π(d/2)

(2 gets cancelled out)

= πd

= 22/7 × 7

= 22 cm

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So for the largest area, since you know that you have 40 fences, and each are 1 meter long, and they’re also asking for the largest rectangular area, this means that only the opposite sides will have the same length, so in order to divide the rectangle with the 40 one-meter fences, the biggest sides have to be 15 meters long (so for both : 15x2=30 meters). Then you deduct from 40, 30 : 40-30 = 10 which then you can devide by 2 and find 5 + 5 and that means that the 2 smallest sides will be 5 meters long each. Then finally to calculate the perimeter you should do the biggest side multiplied by the smallest side : 15 x 5 and you find 75 m2 (squaremeters), if I’m not mistaken.

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