Question

4. What is the cost of fencing
(a) a rectangular field 80 m by 45 m if fencing costs 85.40 per metre?
(b) a square field with sides 57.5
m, when fencing costs < 76.25 per metre?
(c) a triangular garden with sides 20.4 m, 63.8 m and 48.7 m, when fencing costs 39.80 per
metre?​

Answer 1

Answer:

here u go

Step-by-step explanation:

Perimeter of 80 m by 45 m = 2 ( 80 + 45) = 250 m

fencing costs 85.40 per metre

cost of fencing = 250 * 85.4  = Rs 21350

Perimeter  a square field with sides 57.5 m,  = 4 * 57.5 = 230 m

fencing costs 76.25 per metre

cost of fencing = 230 * 76.25  = Rs 17,537.5‬

Perimeter of a triangular garden with sides 20.4 m, 63.8 m and 48.7 m

= 20.4 + 63.8 + 48.7

= 132.9 m

fencing costs 39.8 per metre

cost of fencing = 132.9 * 39.8  = Rs 5,289.42‬

5. (a) The perimeter of a square is 80 m.

the length of each side of the square = 80/4 = 20 m

b) The perimeter of a rectangular card is 400 mm and its length is 6 cm.

6 cm = 60 mm

=> 2 ( 60 + b) = 400

=> 60 + b = 200

=> b =140  mm

b = 14 cm

Answer 2

Answer:

a) peimeter= 2[80+45]=250

cost= 250 x 85.4= 21350

b) perimeter= 57.5 x 4 = 230

cost= 230 x 76.25= 17537.5

c) perimeter= 20.4 + 63.8 + 48.7= 132.9

cost= 132.9 x 39.8= 5289.42

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