Tolong jawab segera soalnya itu mau dikumpul besok

Tolong jawab segera soalnya itu mau dikumpul besok

1). Jari-jari = 15 cm

A].

Diameter = jari-jari x 2

Diameter = 15 x 2

Diameter = 30 cm

B].

Keliling = 2 x π x r

Keliling = 2 x 3,14 x 15

Keliling = 2 x 47,1

Keliling = 94,2 cm

C].

Luas = π x r²
Luas = 3,14 x 15²
Luas = 3,14 x 225
Luas = 706,5 cm²

2). Diameter = 7 cm

A].
Jari-jari = Diameter/2
Jari-jari = 7/2
Jari-jari = 3,5 cm

B].
Keliling = 2 x π x r
Keliling = 2 x 22/7 x 3,5
Keliling = 2 x 11
Keliling = 22 cm

C].
Luas = π x r²
Luas = 22/7 x 3,5²
Luas = 22/7 x 12,25
Luas = 38,5 cm²

3). Keliling = 66 cm

A].
Keliling = 2 x π x r
66 = 2 x 22/7 x r
66 = 44/7r
r = 66 x 7/44
r = 10,5 cm

B].
Diameter = Jari-jari x 2
Diameter = 10,5 x 2
Diameter = 21 cm

C].
Luas = π x r²
Luas = 22/7 x 10,5²
Luas = 22/7 x 110,25
Luas = 346,5 cm²

4). Luas = 314 cm²

A].
Luas = π x r²
314 = 3,14 x r²
r² = 314/3,14
r² = 100
r = √100
r = 10 cm

B].
Diameter = jari-jari x 2
Diameter = 10 x 2
Diameter = 20 cm

C].
Keliling = 2 x π x r
Keliling = 2 x 3,14 x 10
Keliling = 62,8 cm

1. diameter = 2 × 15 = 30

$keliling : = 2pi : r \ 2 times 3.14 times 15 = 94.2$

$luas : = pi : r {}^{2} \ 3.14 times 15 times 15 =71.65$

$luas : = 7 div 2 = 3.5$

$keliling : = 2pi : r \ 2 times 3.5 times frac{22 }{7} = 22$

$luas : = pi : {r}^{2} \ = 3.5 times 3.5 times 3.14 = 38.465$

maaf cuma bsa segitu