Question

Va rog ex 13,14 dau 50 pct

Answer 1

Sper ca te-am ajutat! Mult noroc la scoala!

Answer 2

$13.\:P_{\triangle}=a+b+c$

$a)\,P_{\triangle}=5\,cm+8\,cm+10\,cm=23\,cm$

$b)\,P_{\triangle}=4,2\,m+5,12\,m+6,312\,m=9,32\,m+6,312\,m=15,632\,m$

$c)\,10\,m=10\cdot 10\,dm=100\,dm$

  $0,11\,hm=0,11\cdot 1000\,dm=110\,dm$

  $\implies P_{\triangle}=20\,dm+100\,dm+110\,dm=230\,dm$

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$14.\: P_{\triangle echilateral} = 3\cdot l$

$0,21 \, m = 0,21\, \cdot 10\,dm=2,1\,dm$

$P_{\triangle echilateral}=3\cdot l \implies l = \frac{P}{3} =\frac{2,1\,dm}{3} =0,7\,dm$