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d= r1 sin A + r2sin (A+B) + r3 sin(B+C)
d= 2 sin 30° + 2 sin (30°+ 30°) + 2 sin (60° + 30°)
d= 2× 0,5 + 2 × 0,5 sqrt 3 + 2×1
d = 1 + sqrt 3 + 2
d = 3 + sqrt 3 cm
catatan
sqrt 3 dibaca square root 3 atau akar 3
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