Question

Luas daerah yang diarsir adalah... cm².​

Answer 1

Penjelasan dengan langkah-langkah:

Diketahui:

Lingkaran, dengan:

• Diameter (d) = 14 cm
• Jari-jari (r) = [tex]\sf \frac{1}{2} d = \frac{1}{2} (14) = \bf 7 \ cm[/tex]
• [tex]\sf \pi = \frac{22}{7}[/tex]

Ditanyakan:

Luas daerah yang diarsir/ setengah lingkaran?

Penyelesaian:

Rumus luas setengah lingkaran: [tex]\sf \bf L = \frac{1}{2} \times Luas \ lingkaran = \frac{1}{2} \times \pi r^2 \iff \boxed {\sf \bf L = \frac{\pi r^2}{2} }[/tex], maka:

[tex]\sf \bf L = \frac{\pi r^2}{2}\\\sf \bf L = \frac{\frac{22}{7} \times 7^2}{2}\\\sf \bf L = \frac{\frac{22}{7} \times 7 \times 7}{2}\\\sf \bf L = \frac{22 \times 7}{2}\\\sf \bf L = 11 \times 7 \\\underline {\boxed {\blue {\sf \bf L = 77 \ cm^2 \ (B)}}}[/tex]

[tex] \large {\boxed {\blue {\star \:Answered  \: By: \:  \bold {sulkifli2018} \star} } } [/tex]

Answer 2

Jawaban:

L setengah lingkaran = πr^2/2

L = πr^2/2

L = 22/7.7^2/2

L = 22/7.49/2

L = 22.7/2

L = 154/2

L = 77 cm^2