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sinα30=1\2
1\2a=10 /*2
a=20
2)
sin²α+cos²α=1
(2\3)²+cos²α=1
4\9+cos²α=1
cos²α=9\9-4\9
cos²α=5\9 /√
cosα=√5\3
4)
tgα=1\2
sinα=a\c=1\√5 *√5\√5=√5\5
cosα=b\c=2\√5*√5\√5=2√5\5
1²+2²=c²
1+4=c²
5=c² /√c
c=√5
7)
(3√2)²+b²=(3√3)²
18+b²=27
b²=27-18
b²=√9
b=3
sinα=a\c=3√2\ 3√3 * 3√3\3√3=9√6\ 9*3= 9√6\27=√6\3