Răspuns:
Explicație pas cu pas:
a) sinR=PQ/QR=1/8 ∡R=arcsin 1/8 ∡Q=arccos1/ 8
b)tg Q=PR/PQ=5√2/5=√2 ∡Q=arctg √2 ∡R =arcctg√2
c) sin Q=PR/QR=8/10 ∡Q=arcsin 4/5 ∡R=arccos4/5
