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a² + a² = √32
2a² =√32
a² = √32 : √4 = √8
a = 2√2
b..pakai aturan sinus
√32 = √a²+a²
32 = 2a²
16 = a²
4 cm = a
b => menghadap sudut 60 derajat
16 cm menghadap sudut 90 derajat
30° : 60° : 90° = 1 : √3 : 2
b = 16: 2 x √3 = 8√3