Jawabanmu

2014-05-22T19:31:38+07:00
Luas juring = sudut/360 x Luas lingkaran 
= 45/360 x π r²
= 1/8 x (22/7 x 14 x 14)
= 1/8 x 616
= 77 cm²
2014-05-22T19:32:24+07:00
L . juring = 1/8 x 22/7 x 14 x 14 
= 1/8 x 616 = 77 cm2