Question

Toloong banggeet kakak aku butuh bgt buat pr besok sekalian buat belajar klo udh dijawab makasih kalo ada yg mau jawab .
1. Diameter :21cm
Rusuk =
Keliling =
Luas =

2. Keliling 88cm
Diameter=
Rusuk=
Luas =

3. Keliling 62,8cm
Diameter =
rusuk=
luas=

4. Luas 616cm²
Rusuk =
Diameter =
keliling =

5. Luas 314cm²
rusuk =
diameter =

Answer 1

1. Diameter 21:
r = 21 : 2 =
kel = d x π
     = 21 x = 3 x 22 =66
luas = π x r x r
       = x x = 173,25

2. Keliling 88cm:
d = 88 x = 4 x 7 = 28
r = 88 : 3, 14 = (bulatkan jadi:) 28
  = 28 : 2 = 14
luas = π x r x r = x 14 x 14 = 616 cm²

3. Keliling 62, 8 :
d = 62, 8 x = (bulatkan jadi:) 20
r = 62,8 : 3,14 = 20 : 2 = 10
luas = 3, 14 x 10 x 10 = 314

4. Luas 616 cm²:
r = 616 x = =44
d =  44 x 2 = 88
keliling =  88 x 3,14 = 276, 32

5. Luas 314 cm2:
r = 314 x 3, 14 = 985, 96
d = 985, 96 x 2 = 1971, 92