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Use formula "Area of trapezium = \frac{1}{2}h(a+b)", where
h → distance between parallel sides
a, b → lengths of parallel sides.
Answer is 210 cm².
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Area of trapezium= \frac{1}{2} (a+b)*h
 we have a=20cm , b=15cm h=12cm
 area =  \frac{1}{2} (15+20)12
area= 210 cm²
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