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L OQPR = 1/2 × OP × QR
1200 = 1/2 × OP × 48
1200 = 24 OP
OP = 1200 / 24
OP = 50 cm
b)
PQ² = OP² - OQ²
= 50² - 30²
= 2500 - 900
= 1600
PQ = √1600
PQ = 40 cm