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21.A
22.D
sorry y kalau salah
21. 90 + x² + 3x² = 180
90 + 4x² = 180
4x² = 180 - 90
4x² = 90
x² = 22,5
jadi sudut B = 3x² = 3 (22,5)
= 67,5 (C)
22. 50 = a
100 40
100a = 20000
a = 20 cm (A)
semoga benar dan maaf kalau salah