Gunakan aturan sinus untuk memproleh sudut B.

<img align="middle" alt="table attributes columnalign right center left columnspacing 0px end attributes row cell fraction numerator a over denominator sin space A end fraction end cell equals cell fraction numerator b over denominator sin space B end fraction end cell row cell fraction numerator 2 over denominator sin space 30 degree end fraction end cell equals cell fraction numerator 4 over denominator sin space B end fraction end cell row cell sin space B end cell equals 1 row B equals cell 90 degree end cell end table" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mtable columnspacing=¨0px¨ columnalign=¨right center left¨»«mtr»«mtd»«mfrac»«mi»a«/mi»«mrow»«mi»sin«/mi»«mo»§#160;«/mo»«mi»A«/mi»«/mrow»«/mfrac»«/mtd»«mtd»«mo»=«/mo»«/mtd»«mtd»«mfrac»«mi»b«/mi»«mrow»«mi»sin«/mi»«mo»§#160;«/mo»«mi»B«/mi»«/mrow»«/mfrac»«/mtd»«/mtr»«mtr»«mtd»«mfrac»«mn»2«/mn»«mrow»«mi»sin«/mi»«mo»§#160;«/mo»«mn»30«/mn»«mo»§#176;«/mo»«/mrow»«/mfrac»«/mtd»«mtd»«mo»=«/mo»«/mtd»«mtd»«mfrac»«mn»4«/mn»«mrow»«mi»sin«/mi»«mo»§#160;«/mo»«mi»B«/mi»«/mrow»«/mfrac»«/mtd»«/mtr»«mtr»«mtd»«mi»sin«/mi»«mo»§#160;«/mo»«mi»B«/mi»«/mtd»«mtd»«mo»=«/mo»«/mtd»«mtd»«mn»1«/mn»«/mtd»«/mtr»«mtr»«mtd»«mi»B«/mi»«/mtd»«mtd»«mo»=«/mo»«/mtd»«mtd»«mn»90«/mn»«mo»§#176;«/mo»«/mtd»«/mtr»«/mtable»«/math»" role="math" src="data:image/png;base64,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" style="max-width: none;" />

Jadi, besar sudut B adalah <img align="middle" alt="90 degree" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mn»90«/mn»«mo»§#176;«/mo»«/math»" role="math" src="data:image/png;base64,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" style="max-width: none;" />.

<img alt="" src="https://imgix2.ruangguru.com/assets/miscellaneous/png_pbwxlk_78.png" style="width: 200px; height: 135px;" />

Tentukan :

a. besar sudut B

matematika

bahasa indonesia

ipa terpadu

fisika

biologi

bahasa inggris

geografi

sosiologi

sejarah

kimia

ekonomi

Tentukan : a. besar sudut B

Jawaban: