P∆MNP= MN+MP+NP= 18
MN= 7, NP= 5
7+MP+5=18, rezulta MP= 6
AB= MN=7
BC= NP= 5
AC=MP= 6
prin urmare cele doua ∆ au laturi congruente, si conform criteriului de congruenta LUL sunt congruente.
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P∆MNP= MN+MP+NP= 18
MN= 7, NP= 5
7+MP+5=18, rezulta MP= 6
AB= MN=7
BC= NP= 5
AC=MP= 6
prin urmare cele doua ∆ au laturi congruente, si conform criteriului de congruenta LUL sunt congruente.