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Luas segi-12 beraturan dengan panjang jari-jari lingkaran luarnya r adalah...

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Klaim

F. Kurnia

Master Teacher

Mahasiswa/Alumni Universitas Jember

Jawaban terverifikasi

Pembahasan

$S u d u t space d a l a m space s e g i space 12 equals fraction numerator 360 degree over denominator 12 end fraction equals 30 degree L u a s space s e b u a h space s e g i t i g a space p a d a space s e g i minus 12 comma L equals 1 half a b s i n invisible function application C rightwards double arrow L equals 1 half r left parenthesis r right parenthesis s i n invisible function application 30 degree equals 1 fourth r squared space T e r d a p a t space 12 space b u a h space s e g i t i g a space p a d a space s e g i minus 12 comma space m a k a L subscript t o t a l end subscript equals 12 cross times L L subscript t o t a l end subscript equals 12 cross times 1 fourth r squared L subscript t o t a l end subscript equals 3 r squared$