Question

Tolong ya jawab no 1,2,& 3

Answer 1

1. keliling =
a. k = 2 x phi x r = 2 x 22/7 x 49 = 308 cm
b. k = 2 x phi x r = 2 x 22/7 x 21 =132 cm
c. k = 2 x phi x r = 2 x 3,14 x 5 = 31,4 cm
d. k = 2 x phi x r = 2 x 3,14 x 12 = 7,536 cm
e. k = 2 x phi x r = 2 x 3,14 x 10,5 = 65,94 cm

2. s = keliling x n putaran = ( 2x3,14x3) x 5 = 94,2 cm

3. daerah arsir
a. k p.panjang = 2 x (p+l) = 2 x (42) = 84 cm
keliling lingkaran = phi x d = 22/7 x 14 = 44 cm
keliling daerah arsir = 84 cm - 44 cm = 40 cm
b. keliling 1/4 ling. = 1/4 x 2 x phi x r = 1/4 x 2 x 3,14 x 10 = 62,8 cm
c. keliling persegi = 4 x s = 4 x 21 = 84 cm
keliling 1/2 ling. = 1/2 x phi x d = 1/2 x 22/7 x 21 = 33 cm
keliling daerah arsir = 84 + 33 = 117 cm
d. keliling 1/2 ling. besar = 1/2 x 2 x phi x r = 1/2 x 2 x 3,14 x 10 = 31,4 cm
keliling 1/2 ling.kecil (arsir) = 1/2 x phi x d = 1/2 x 3,14 x 10 = 15,7 cm
keliling 1/2 ling.kecil (tdk arsir) = 1/2 x phi x d = 1/2 x 3,14 x 10 = 15,7 cm
keliling daerah arsir = 31,4 - 15,7 + 15,7 = 31,4 cm

maaf jika ada yg salah ^^