Question

Решите 1 вариант ( В-1 )

Answer 1

Соs60=ab/ad

Ad=ab/cos60=20*1/2=40

Соs45=ab/ac

Ac=ab/cos45=20*2/√2=40/√2

Answer 2

cos60=20/AD=1/2, AD=40

cos45=20/AC=/2/2, AC=20/2