buna seara!
Ma poate ajuta cineva va rog la acest ex?
va rog muult!

Răspuns:
a)
BC^2=AB^2+AC^2
BC^2=3^2+4^2
BC^2=9+16
BC^2=25
BC=√25
BC=5
b)
BC^2=AB^2+AC^2
BC^2=15^2+20^2
BC^2=225+400
BC^2=625
BC=√625
BC=25
c)
BC^2=AB^2+AC^2
BC^2=6^2+8^2
BC^2=36+64
BC^2=100
BC=√100
BC=10
d)
BC^2=AB^2+AC^2
BC^2=18^2+24^2
BC^2=324+576
BC^2=900
BC=√900
BC=30