No. Jari jari lingkaran Diameter

Berikut ini adalah pertanyaan dari oppoanane2222 pada mata pelajaran Matematika untuk jenjang Sekolah Dasar

No. Jari jari lingkaran Diameter lingkaran Luas lingkaranA. 4 cm ... Cm ... Cm
B. 21cm ... Cm ... Cm
C. ... Cm 50cm ... Cm
D. ....Cm 56cm ... Cm
E. ....Cm ... Cm 154Cm

Jawaban dan Penjelasan

Berikut ini adalah pilihan jawaban terbaik dari pertanyaan diatas.

$\mathbb{ \color{aqua}{ \underbrace{JAWABAN}}}$

$\boxed{ \begin{array}{c|c|c|c} \bf{No.}&\bf{Jari - jari}&\bf{Diameter}&\bf{Luas} \\ &\bf{lingkaran}&\bf{lingkaran}&\bf{lingkaran} \\ \hline \\ \sf{A.}&\tt{4 \: cm}&\bf{8 \: \tt{cm}}&\bf{50{,}24 \: \tt{{cm}^{2} }} \\ \\ \hline \\ \sf{B.}&\tt{21 \: cm}&\bf{42 \: \tt{cm}}&\bf{1.386 \: \tt{{cm}^{2} }} \\ \\ \hline \\ \sf{C.}&\bf{25 \: \tt{cm}}& \tt{50 \: cm}&\bf{1.962{,}5 \: \tt{{cm}^{2} }} \\ \\ \hline \\ \sf{D.}& \bf{28 \: \tt{cm}}& \tt{56 \: cm}& \bf{2.464 \: \tt{ {cm}^{2} }} \\ \\ \hline \\ \sf{E.}& \bf{7 \: \tt{cm}}& \bf{14 \: \tt{cm}}& \tt{154 \: {cm}^{2}} \\ \\ \end{array}}$

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$\mathbb{ \color{orange}{ \underbrace{PENYELESAIAN}}}$

SOAL A :

diameter lingkaran (d)

$\boxed{ \: \begin{aligned} \tt{d} &= \tt{2 \times r} \\ \tt{d} &= \tt{2 \times 4} \\ \tt{d} &= \red{ \boxed{ \bf{ \pink{8 \: cm}}}} \end{aligned} \: } \\ \\$

luas lingkaran (L)

$\boxed{ \: \begin{aligned} \tt{L} &= \tt{\pi \times {r}^{2} } \\ \tt{L} &= \tt{3{,}14 \times {4}^{2} } \\ \tt{L} &= \tt{3{,}14 \times 16} \\ \tt{L} &= \red{ \boxed{ \bf{ \pink{50{,}24 \: {cm}^{2} }}}} \end{aligned} \: } \\ \\$

SOAL B :

diameter lingkaran (d)

$\boxed{ \: \begin{aligned} \tt{d} &= \tt{2 \times r} \\ \tt{d} &= \tt{2 \times 21} \\ \tt{d} &= \red{ \boxed{ \bf{ \pink{42 \: cm}}}} \end{aligned} \: } \\ \\$

luas lingkaran (L)

$\boxed{ \: \begin{aligned} \tt{L} &= \tt{\pi \times {r}^{2} } \\ \tt{L} &= \tt{ \frac{22}{7} \times {21}^{2} } \\ \tt{L} &= \tt{ \frac{22}{ \bcancel{7}} \times { \bcancel{441}}^{63} } \\ \tt{L} &= \red{ \boxed{ \bf{ \pink{1.386 \: {cm}^{2} }}}} \end{aligned} \: } \\ \\$

SOAL C :

jari-jari lingkaran (r)

$\boxed{ \: \begin{aligned} \tt{r} &= \tt{ \frac{1}{2} \times d} \\ \tt{r} &= \tt{ \frac{1}{ \bcancel{2}} \times {\bcancel{50}}^{25} } \\ \tt{r} &= \red{ \boxed{ \bf{ \pink{25 \: cm}}}} \end{aligned} \: } \\ \\$

luas lingkaran (L)

$\boxed{ \: \begin{aligned} \tt{L} &= \tt{\pi \times {r}^{2} } \\ \tt{L} &= \tt{3{,}14 \times {25}^{2} } \\ \tt{L} &= \tt{3{,}14 \times 625} \\ \tt{L} &= \red{ \boxed{ \bf{ \pink{1.962{,}5 \: {cm}^{2} }}}} \end{aligned} \: } \\ \\$

SOAL D :

jari-jari lingkaran (r)

$\boxed{ \: \begin{aligned} \tt{r} &= \tt{ \frac{1}{2} \times d} \\ \tt{r} &= \tt{ \frac{1}{ \bcancel{2}} \times {\bcancel{56}}^{28} } \\ \tt{r} &= \red{ \boxed{ \bf{ \pink{28 \: cm}}}} \end{aligned} \: } \\ \\$

luas lingkaran (L)

$\boxed{ \: \begin{aligned} \tt{L} &= \tt{\pi \times {r}^{2} } \\ \tt{L} &= \tt{ \frac{22}{7} \times {28}^{2} } \\ \tt{L} &= \tt{ \frac{22}{ \bcancel{7}} \times { \bcancel{784}}^{112} } \\ \tt{L} &= \red{ \boxed{ \bf{ \pink{2.464 \: {cm}^{2} }}}} \end{aligned} \: } \\ \\$

SOAL E :

jari-jari lingkaran (r)

$\boxed{ \: \begin{aligned} \tt{L} &= \tt{\pi \times {r}^{2} } \\ \tt{154} &= \tt{ \frac{22}{7} \times {r}^{2} } \\ \tt{154 \times 7} &= \tt{22 \times {r}^{2} } \\ \tt{1.078} &= \tt{22 \times {r}^{2} } \\ \tt{ \frac{1.078}{22} } &= \tt{ {r}^{2} } \\ \tt{49} &= \tt{ {r}^{2} } \\ \tt{ \sqrt{49} } &= \tt{r} \\ \tt{ \sqrt{{7}^{2} }} &= \tt{r} \\ \red{ \boxed{ \bf{ \pink{7 \: cm}}}} &= \tt{r} \end{aligned} \: } \\ \\$

diameter lingkaran (d)

$\boxed{ \: \begin{aligned} \tt{d} &= \tt{2 \times r} \\ \tt{d} &= \tt{2 \times 7} \\ \tt{d} &= \red{ \boxed{ \bf{ \pink{14 \: cm}}}} \end{aligned} \: }$

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