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x + 28 + 3x - 10 = 90
4x + 18 = 90
4x = 90 - 18
4x = 72
x = 72 : 4
x = 18°
∠PQS = x + 28° = 18° + 28° = 46°
Jawaban: B
29. A. CD. Garis berat adalah garis yang membagi sisi depannya menjadi sama panjang.
30. p = R + r
p = 32 + 18
p = 50 cm
l² = p² - (R - r)²
l² = 50² - (32 - 18)²
l² = 2500 - 14²
l² = 2500 - 196
l² = 2304
l = √2304
l = 48 cm
Jawaban: B