4. K = 2πr =2 x 22/7 x21 = 2 x 66 =132 cm a=∠PAB : Panjang busur/keliling = sudut pusat/360° 22/132 =α/360 1/6 =α/360 α=360 x 1/6 =60° b.busur AB sudah di ketahui 22 cm caranya = AB/132 =60/360 AB/132 =1/6 AB= 1/6 x 132 = 22 cm
c.Luas juring = 60/360 x πr² =1/6 x 22/7 x 21² = 1/6 x 22/7 x 441 =1/6 x 1386 = 231 cm²
Verified answer
4. K = 2πr =2 x 22/7 x21 = 2 x 66 =132 cma=∠PAB :
Panjang busur/keliling = sudut pusat/360°
22/132 =α/360
1/6 =α/360
α=360 x 1/6
=60°
b.busur AB sudah di ketahui 22 cm
caranya = AB/132 =60/360
AB/132 =1/6
AB= 1/6 x 132
= 22 cm
c.Luas juring = 60/360 x πr²
=1/6 x 22/7 x 21²
= 1/6 x 22/7 x 441
=1/6 x 1386
= 231 cm²