L PQR = ¹/₂ × a ×t
= ¹/₂ × 10 × (8+16)
= 5 × 24 = 120cm
L PRS = ¹/₂ × a ×t
= ¹/₂ × 8 × 10
= 4 × 10 = 40cm
L PQS = L PQR − L PRS
= 120 − 40 = 80cm
jawabannya C
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L PQR = ¹/₂ × a ×t
= ¹/₂ × 10 × (8+16)
= 5 × 24 = 120cm
L PRS = ¹/₂ × a ×t
= ¹/₂ × 8 × 10
= 4 × 10 = 40cm
L PQS = L PQR − L PRS
= 120 − 40 = 80cm
jawabannya C