Q.Diketahui jari jari lingkaran adalah 21 cm, tentukan keliling dan luasnya !.... Question from @nxyaptrf

nxyaptrf @nxyaptrf

May 2022 2 22 Report

Q.

Diketahui jari jari lingkaran adalah 21 cm, tentukan keliling dan luasnya !

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Keliling Lingkaran

2πr

2 × 22/7 × 21

2 × 22 × 3

44 × 3

132 cm

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Luas Lingkaran

πr²

22/7 × 21²

22/7 × 21 × 21

22 × 3 × 21

66 × 21

1.386 cm²

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1 votes Thanks 1

nxyaptrf oky

jeremisaragih44

PEMBAHASAN:

rumus luas lingkaran:

$\boxed{ \bf \pi {r}^{2} }$

rumus keliling lingkaran:

$\boxed{ \bf \pi d } \: atau \: \boxed{ \bf2 \pi r}$

Keliling:

$2 \times \pi \: \times r \\ = 2 \times \frac{22}{ \cancel{7} \: {}^{1} } \times \cancel{21} \: {}^{3} \\ = 44 \times 3 \\ = \bf \: 132 \: cm$

Luas:

$\pi \times {r}^{2} \\ = \frac{22}{ \cancel7 \: {}^{1} } \times \cancel{21} \: {}^{3} \times 21 \\ = 22 \times 3 \times 21 \\ = 66 \times 21 \\ = \bf1.386 \: cm {}^{2}$

2 votes Thanks 1

nxyaptrf okh, makasi kaa

jeremisaragih44 Sama-sama

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