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2014-09-01T17:24:50+03:00
L/L= 4/5

l/20=4/5

l=20*4/5

l=4*4

l=16

P=2l+2L=2*16+2*20= 32+40=72
 

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2014-09-02T01:03:45+03:00
 \frac{x}{20} = \frac{4}{5}

x=20x4:5
x=16(latimea)

perimetrrul=2(20+16)
=2x36
=72