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PQ² = OP² - OQ²
= 20² - 12²
= 400 - 144
= 256
PQ = √256
= 16 cm
L layang2 PQOR = 2 × 1/2 × a × t
= 2 × 1/2 × 12 × 16 cm²
= 192 cm²
L layang2 = 1/2 × d₁ × d₂
192 = 1/2 × 20 × QR
192 = 10 QR
QR = 192 / 10
QR = 19,2 cm (C)