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QR = 40 cm
PR = 25 cm
∠RQS = 30°
Ditanyakan :
panjang PS
Jawab :
Sin 30° = 1/2
RS / QR = 1/2 → RS = 1/2 x 40 = 20 cm
PS² = PR² - SR²
PS² = 25² - 20²
PS² = 625 - 400
PS = √225
PS = 15 cm (c)
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