Question

tolong di bantu jawab ya pakai cara ya makasih ​

Answer 1

Jawaban:

Penyelesaian :

• Diameter = 28 cm
• Jari - jari = 28 : 2 = 14 cm
• Keliling = ...

Keliling ½ lingkaran

[tex] \sf Keliling = \frac{1}{2} \times (2 \times \pi \times r)[/tex]

[tex] \sf Keliling = \frac{1}{2} \times (2 \times \frac{22}{7} \times 14)[/tex]

[tex] \sf Keliling = \frac{1}{2} \times (2 \times \frac{22}{ \cancel{7}} \times { \cancel{14}}^{ \: \: 2} )[/tex]

[tex] \sf Keliling = \frac{1}{2} \times (2 \times 22 \times 2)[/tex]

[tex] \sf Keliling = \frac{1}{2} \times (2 \times 44)[/tex]

[tex] \sf Keliling = \frac{1}{2} \times 88[/tex]

[tex] \sf Keliling = 44 \: cm[/tex]

Answer 2

Jawaban:

keliling lingkaran = 2πr

jika setengah lingkaran = ½.2πr

d = 28

(π=22/7)

½ keliling lingkaran = ½πd

½ keliling lingkaran = ½22/7(28)

½ keliling lingkaran = ½22(4)

½ keliling lingkaran = ½88

½ keliling lingkaran = 88/2

½ keliling lingkaran = 44 cm