Question

lanjoet ngabs

selamat berpikir​

Answer 1

84°

• opsi A

Penjelasan dengan langkah-langkah :

21. < ABC = 180° – (2x + 40°)

< ACB = 180° – (3x + 30°)

< ABC + < ACB + < BAC = 180°

180° – (2x + 40°) + 180° – (3x + 30°) + 70° = 180°

140° – 2x + 150° – 3x + 70° = 180°

-5x + 360° = 180°

-5x = -180°

x = 36°

< BCA = 180° – (2x + 40)

< BCA = 180° – (2(36) + 40)

< BCA = 180° – 96°

< BCA = 84°

• opsi A

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