a=12,5 ,b=10, dan
Matematika
andi706
Pertanyaan
a=12,5 ,b=10, dan <A=110°. hitung besar <B, <C, dan panjang c
1 Jawaban
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1. Jawaban bettydaluyani
dgn aturan sinus
a/sin A = b/sin B
12.5/ sin 110° = 10/ sin B
12.5/ 0.939 = 10/ sin B
sin B = (10×0.939)/12.5
sin B = 0.751
<B = 48,5°
<C= 180-110-48,5 = 21,5°
b/ sin B = c/ sin C
10/ 0.751 = c/ sin 21,5°
10/ 0.751 = c/ 0.367
c = (10/ 0.751) x 0.367
c = 2,8