Răspuns :
unghi complementar=90 grade
A+B=90
A=2k
B=7K
2K+7K=90
9K=90
K=90:9
K=10
A=2*10
A=20 grade
B=7*10=70 grade
A+B=90
A=2k
B=7K
2K+7K=90
9K=90
K=90:9
K=10
A=2*10
A=20 grade
B=7*10=70 grade