Question

ajutor,nu stiu cum sa fac​

Answer 1

Răspuns:

Explicație pas cu pas:

In Δ ABC    AC²=AB²+BC²=144+25=169      AC=13 cm

sin α=AB/AC=12/13

cosα=BC/AC=5/13

tgα=AB/BC=12/5

ctgα=BC/AB=5/12

ex 2   ΔDKR     DK²=KR²-DK²=17²-15²=2·32=2^6     DK=2³=8 cm

sin β=DK/KR=15/17

cos β=DR/KR=8/17

tg β=DK/DR=15/8

ctg β=DR/DK=8/15