Question

tolong bantu jawab Kaka kaka​

Answer 1

Verified answer

rumus
keliling = 2 x phi x r
luas = phi x r^2
d = 2 x r

a. keliling = 308
308 = 2 x 3,14 x r
r = 308 / (2 x 3,14)
r = 49 cm
d = 2 x r
d = 2 x 49
d = 98 cm

b. d = 24 cm
d = 2 x r
r = d / 2
r = 24 / 2
r = 12 cm
k = 2 x phi x r
k = 2 x 3,14 x 12
k = 75 cm

c. r = 15 cm
d = 2 x r
d = 2 x 15
d = 30 cm
k = 2 x phi x r
k = 2 x 3,14 x 30
k = 188 cm

Answer 2

A. Diketahui :

• K = 308cm

Ditanya :

• d = ?
• r = ?

Jawab :

°•°•°•°•°•°•°•°•°•°•°•°•°

[tex]d = \frac{7 \times k}{22}[/tex]

[tex]d = \frac{7 \times 308}{22} [/tex]

[tex]d = \frac{2.156}{22} [/tex]

[tex]d = 98[/tex]

Jadi, d (diameter) lingkaran tersebut adalah 98cm.

°•°•°•°•°•°•°•°•°•°•°•°•°

[tex]r = d \div 2[/tex]

[tex]r = 98 \div 2[/tex]

[tex]r = 49[/tex]

jadi, r (jari-jari) lingkaran tersebut adalah 49cm

B. Diketahui :

• d = 24cm

Ditanya :

• k = ?

Jawab :

[tex]k = 3.14 \times d[/tex]

[tex]k \: = 3.14 \times 24[/tex]

[tex]k = 75.36cm[/tex]

Jadi, keliling lingkaran tersebut adalah 75,36cm

C. Diketahui :

• r = 15cm

Ditanya :

• k = ?

Jawab :

[tex]k = 3.14 \times (r \times 2)[/tex]

[tex]k = 3.14 \times (15 \times 2)[/tex]

[tex]k = 3.14 \times 30[/tex]

[tex]k = 94.2[/tex]

Jadi, keliling lingkaran tersebut adalah 94,2cm