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PR = 12
PQ = 20
QR = x
x² = PR² + PQ²
x² = 12² + 20²
x² = 144 + 400
x² = 544
x = √544 = 23,32
Nomor 2
BC = 25
AB = 20
AC² = BC² - AB²
AC² = 25² - 20²
AC² = 625 - 400
AC = √225 = 15
Nomor 3
KM = 5
KL = 6
LM² = KL² - KM²
LM² = 36 - 25
LM = √11 = 3,3