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sin 30 = ST/RT
1/2 = 6/RT
RT = 12
Cari panjang SR
cos 30 = SR / TR
√3/2 = SR/12
12√3 = 2SR
SR = 6√3
a. L = 1/2 x 6 x 6√3 = 18√3
b. (Sin T)² + (Sin R)² = 3/4 + 1/4 = 1