Bantu yg nomor 2 yang abcd makasih.... Question from @BerakLupaCebok

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Ditanya Luas Lingkaran
rumus luas lingkaran =
L= π r²

$L =\frac{22}{7} r^{2}$

r = 1/2diameter

maka

$L= \frac{22}{7} (\frac{d}{2}) ^{2} \\ \\ L= \frac{22}{7} .\frac{d}{2} . \frac{d}{2}$

a. d=7cm
$L= \frac{22}{7} (\frac{7}{2}) ^{2} \\ \\ L= \frac{22}{7} .\frac{7}{2} . \frac{7}{2}=38,5cm$

b. d=28
$L= \frac{22}{7} (\frac{28}{2}) ^{2} \\ \\ L= \frac{22}{7} .\frac{28}{2} . \frac{28}{2}=616cm<span>$

c. d = 1,4
$L= \frac{22}{7} (\frac{1,4}{2}) ^{2} \\ \\ L= \frac{22}{7} .\frac{1,4}{2} . \frac{1,4}{2}=1,54cm<span>$

d. d = 5,6
$L= \frac{22}{7} (\frac{1,4}{2}) ^{2} \\ \\ L= \frac{22}{7} .\frac{5,6}{2} . \frac{5,6}{2}=24,64cm<span>$

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algebralover

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Mapel : Matematika
Materi : Bangun Datar - Lingkaran

$a).\ d = 7\ cm\\ \\L=\frac{1}{4}\times \pi \times(d)^2\\ \\L=\frac{1}{4}\times \frac{22}{7}\times7\times7\\ \\L=5,5 \times7\\ \\L=38,5\ cm^2\\ \\ \\b).\ d=28\ cm\\ \\L=\frac{1}{4}\times \pi \times(d)^2\\ \\L= \frac{1}{4}\times \frac{22}{7} \times28\times28\\ \\L=22\times4\times7\\ \\L=616\ cm^2$

$c).\ d=1,4\ cm\\ \\L=\frac{1}{4}\times \frac{22}{7} \times \frac{14}{10}\times \frac{14}{10}\\ \\L=11\times\frac{2}{10}\times\frac{7}{10}\\ \\L=11\times\frac{14}{100}\\ \\L=11\times0,14\\ \\L=1,54\ cm^2\\ \\ \\d).\ d=5,6\ cm\\ \\L=\frac{1}{4}\times \frac{22}{7} \times \frac{56}{10}\times \frac{56}{10}\\ \\L=22\times\frac{14}{10}\times\frac{8}{10}\\ \\L=22\times\frac{112}{100}\\ \\L=22\times1,12\\ \\L=24,64\ cm^2$

***Semoga Terbantu***

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Apakah Pithecanthropus soloensis dan Homo soloensis Itu Berbeda

Keseluruhan pola tingkah laku yang diperoleh dan diturunkan melalui simbol yang akhrinya membentuk sesuatu yang khas dari suatu kelompok disebut

Tolong yang nomor 1 abcdnya

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