Question

Diketahui diameter lingkaran adalah 18 cm luas dan keliling lingkaran adalah

Answer 1

Jawaban:

• Diameter = 18 cm
• Jari - jari = 18 : 2 = 9 cm
• phi (π) = 3,14

Luas lingkaran

[tex] \sf L = \pi \times {r}^{2} [/tex]

[tex] \sf L = 3,14 \times {9}^{2} [/tex]

[tex] \sf L = 3,14 \times 81[/tex]

[tex] \sf L = \red{ 254,34 \: {cm}^{2} }[/tex]

Keliling lingkaran

[tex] \sf K = \pi \times d[/tex]

[tex] \sf K = 3,14 \times 18[/tex]

[tex] \sf K = \red{56,52 \: cm}[/tex]

'조슈아' (Svt)

Answer 2

LP :

= πr²

= π(18/2)²

= π(9)²

= π(81)

= 81(π)

= 3,14(81)

= 254,34 cm²

K = 2πr

= 2(π(18/2)

= 2(π(9)

= 2(9(π)

= 18(π)

= 18(3,14)

= 56,52 cm²