Help pls (1 Viewer)

[bridgetalam]

I don't know how to solve this

 

[Eagle Mum]

It’s just adding the four areas (each is approximately the shape of a trapezium).

Total Area = 7.5x (8.8 + 7.1)/2 + 7.5x (7.1 + 9.8)/2 + 7.5x (9.8 + 8.5)2 + 7.5x (8.5 + 4.9)/2
= 7.5x [8.8 + 2(7.1) + 2(9.8) + 2(8.5) + 4.9]/2 = 242 m^2 (to nearest square metre)

The second equation line is in the format of the trapezoidal rule, whereby the heights (ie. y values of the function if this were a function graph) of all interval values are counted twice but the heights at the boundaries (ie. f(0) & f(n) if this were a function graph) is only counted once.

 

[CM_Tutor]

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[5uckerberg]

If you have a hard day remembering the trapezoidal rule start off simple, eg find the area of 1 trapezium and then stack them together and go on until you develop a sense of confidence. That is find the area of two trapeziums together and then three and then four and so on.