Question

Va rog frumos dau coroana 4 si 5​

Answer 1

4.

a) sin B=AC/BC

3/5=12/BC

BC=5×12/3

BC=5×4

BC=20 cm

b) calculam latura AB cu teorema lui pitagora

AB²=BC²-AC²

AB²=20²-12²

AB²=400-144

AB=rad256

AB=16 cm

acum inaltimea corespunzatoare ipotenuzei se afla cu formula: c1×c2/ip

h=AB×AC/BC

h=16×12/20

h=9,6 cm

5. ab +ba=187

10a+b+10b+a=187

11a+11b=187

a+b=17