So Anar also tried many different ways to make a boundary for 800 square metres of land class 5 math
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So Anar also tried many different ways to make a boundary for 800 square metres of land. -class 5 math

(a) He made rectangles A, B, C of different sizes. Find out the length of the boundary of each. How much gold wire will he get for these rectangles?
(b) Can you make a rectangle with a still longer boundary? I made a rectangle 1 cm wide and 80000 m long. Imagine how long that boundary will be!! With that much gold wire I can become the king!



By:milan-ransingh

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(a) Boundary of a rectangle = 2(Length + Breadth)
Boundary for A = 2(40+20) m = 260 m = 120 m
Gold Wire for A = 120 metres
Boundary for B = 2(80+10) m = 2 90 m = 180 m
Gold Wire for B = 180 metres
Boundary for C = 2(800+1) m = 2 801 m = 1602 m
Gold Wire for C = 1602 metres
Boundary for D = 2(8000+0.1) m = 2 8000.1 m = 16000.2 m
So he will get 16000.2 metres of gold wire.
 
 (b) Yes, a rectangle with a still longer boundary can be made.
 Boundary of a rectangle 1 cm  wide and 80000 m long.
 = 2(.01+80000) m = 2 * 80000.01 m = 160000.02 m

pankaj

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