Question

sebuah lingkaran luasnya 154 cm2(phi 22/7)panjang jari jari lingkarannya adalah​

Answer 1

Panjang jari-jari lingkaran

[tex] \sqrt{Luas \div \pi} \\ \\ \sqrt{154 \div \frac{22}{7} } \\ \\ \sqrt{154 \times \frac{7}{22} } \\ \\ \sqrt{ 7\times 7} \\ \\ 7 \: cm[/tex]

Answer 2

•°• Sebuah lingkaran luasnya 154 cm², (π = 22/7), panjang jari² lingkarannya adlh [tex]\underline{\boxed{\red{\bf{7~cm}}}}[/tex]

[tex] \\ \\ [/tex]

Penjelasan dengan langkah-langkah:

• Luas = 154 cm²
• π = 22/7
• r = ?

[tex] \: \: \: \: \: \: \: \: \: \: \: \: \colorbox{yellow}{ \sf{Panjang Jari-jari }}[/tex]

[tex]\sf{L_{Lingkaran}}[/tex] = [tex]\sf{π × r²}[/tex]

[tex]\sf{154}[/tex] = [tex]\sf{\dfrac{22}{7} × r²}[/tex]

[tex]\sf{r²}[/tex] = [tex]\sf{154 ÷ \dfrac{22}{7}}[/tex]

[tex]\sf{r²}[/tex] = [tex]\sf{7 × 7}[/tex]

[tex]\sf{r²}[/tex] = [tex]\sf{49}[/tex]

[tex]\sf{r}[/tex] = [tex]\sf{\sqrt{49}}[/tex]

[tex]\sf{r}[/tex] = [tex]\sf{\sqrt{7²}}[/tex]

[tex]\sf{r}[/tex] = [tex]\underline{\boxed{\red{\bf{7~cm}}}}[/tex]

[tex] \\ \\ [/tex]

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[tex] \: [/tex]

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