Perhatikan gambar dibawah. Jika panjang busur BC = 18 cm, panjang busur AC adalah..... A. 24 cm B. 28 cm C. 32 cm D. 36 cm
*Mohon bantuannya
tugiman2
18 = 120/360 x 2 x 3.14 x r 18 = 1/3 x 6.28 x r 3 x 18 = 6.28 x r r = 54/6.28 r = 8,6 sudut 180 - 120= 60 60/360 x 2 x 3.14 x 8,6 1/6 x 6.28 x 8,6 1/6 x 54 panjang busur = 54/6 = 9
18 = 1/3 x 6.28 x r
3 x 18 = 6.28 x r
r = 54/6.28
r = 8,6
sudut 180 - 120= 60
60/360 x 2 x 3.14 x 8,6
1/6 x 6.28 x 8,6
1/6 x 54
panjang busur = 54/6 = 9