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3 va rogggggg frumoss

3 Va Rogggggg Frumoss class=

Răspuns :

3 de la varianta 3
DB=√(4²+5²)=√41
BD'=√(√41²+6²)=√(41+36)=√77

3 de la varianta 4
Acon=πrg+Abaza=π×4×5+π×4²=20π+16π=36π cm²