Tolong dong bantu, besok dikumpulin. trus kalo ga ngerjain suruh maju kedepan(“:

Diket = P Garis OD = 6 cm
P garis DA = 5 cm
Besar Sudut COD = 45°
Ditanya = Keliling yg diarsir = ?
Luas yg Diarsir = ?
Jawab = P Garis CD = Besar sudut / 360° x Keliling Lingkaran = 45 / 360 x 2 x 3,14 x 6 cm = 1/8 x 2 x 3,14 x 6 cm = 1/4 x 3,14 x 6 cm = 0,785 x 6 cm = 4,71 cm
P Garis BA = 45 / 360 x 2 x 3,14 x 5 cm = 1/8 x 2 x 3,14 x 5 cm = 1/4 x 3,14 x 5 cm = 0,785 x 5 cm = 3, 925 cm
Keliling yg diarsir = Garis BC + Garis BA + Garis AD + Garis CD = 5 cm + 3,925 cm + 5 cm + 4,71 cm = 18,635 cm

Luas yg diarsir = 45 / 360 x 2 x 3,14 x 5² cm = 1/8 x 2 x 3,14 x 25 cm² = 1/4 x 3,14 x 25 cm² = 0,785 x 25 cm² = 17,125 cm²