TOLONG BANTU JAWAB BUAT KISI KISI UTS BESOK

a. Busur = a/360 x 2.phi.r
= 90/360 . 2 . 22/7 . 28
= 44 cm

b. Juring = a/360.phi.r^2
= 90/360 . 22/7 . 28^2
= 616 cm^2

c. Luas yg diarsir (tembereng) = luas juring AOB - segitiga AOB

Luas segitiga AOB = 1/2.28.28
= 392 cm^2

Tembereng = juring - segitiga
= 616 - 392
= 224 cm^2