PlisJawabDongPlisPlisPlis

BOC=180°-100°
BOC=80°
BDC=80°:2
BDC=40°

7. panjang busur=90°/360x 3,14 x 28
panjang busur=1/4x308
panjang busur=77

luas juring =90°/360°x3,14x14x14
=1/4× 616
=154

6)
a)
∠BOC+∠AOB=180°
  ∠BOC+100°=180°
           ∠BOC=180°-100°
           ∠BOC=80°

b)
∠BDC=∠BOC/2
∠BDC=80°/2
∠BDC=40°

7)
a)
busur ab=K×90°/360°
             =2πr×1/4
             =2×1/4(22/7)(14cm)
             =1/2(44cm)
             =22cm

b)
L juring=L×90°/360°
           =πr²×1/4
           =22/7(14cm)(14cm)×1/4
           =616cm²/4
           =154cm²