pada gambar diatas: OA = 10 cm dan OC=OB=6 cm. panjang tali busur BC adalah...

cara lengkap
AC2= 10^2- 6^2=
100-36=
√64=
8cm
L ∆ abo = 1/2 ×a×t
1/2× 6×8=
24 cm2
L layang = 2×L abo
2× 24=48Cm2
p tali busur = d1×d2 : 2
= oa×bc :2
=10×bc :2. = 48
bc = 48 :5 = 9,6 cm