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23.) B. A2Karena B1, A1, A3, B3 merupakan sudut tumpul. Sedangkan A2 adalah sudut lancip.
24.) 3x + 20 = 4x - 10
3x - 4x = -10 - 20
-x = -30
x = 30 derajat
3x + 20 + y = 180 derajat
3 (30) + 20 + y = 180
90 + 20 + y = 180
y = 180 - 90 - 20
= 70 derajat
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