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Find the area in hectares of a maize field whose measurements are shown in the field book below. The baseline PQ is 300m long. 

   Q  
  250  70B 
 C100  180 
   80 150A 
    P 
 

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F1ET1mathAns18
Area of A = ½ × 80 × 150 = 6000m2
Area of figure B = ½(70+150) × 170 = 18700m2
Area of C = ½ × 50 × 70 = 1750m2
Area of D = ½ × 300 × 100 = 15000m2
Total Area = 15000+6000+1750+18700
                = 41450m2 =4.145ha
                    10000

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