Mathematics
The figure (i) given below shows the cross-section of the concrete structure with the measurements as given. Calculate the area of cross-section.
Mensuration
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Answer
From figure,
The figure consist of a trapezium and a rectangle.
Area of trapezium = (sum of parallel sides) × distance between them
= × (0.6 + 1.5) × (1.2 + 2.4)
= × 2.1 × 3.6
= 2.1 × 1.8
= 3.78 m2.
Area of rectangle = l × b
= 2.4 × 0.3 = 0.72 m2.
Area of cross section = Area of trapezium + Area of rectangle
= 3.78 + 0.72 = 4.5 m2.
Hence, area of cross-section = 4.5 m2.
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