Răspuns :
√80 cm= √2⁴ 5 cm P= L+l+L+l
=2² √5cm P= 2L+ 2l
=4√5cm= L P=2(L+l)
2√6 cm=l P= 2(4√5+2√6) cm
P= ? cm
=2² √5cm P= 2L+ 2l
=4√5cm= L P=2(L+l)
2√6 cm=l P= 2(4√5+2√6) cm
P= ? cm