R Trapezium

Rectangular trapezium has bases 21 and 10 and area 92 cm2. What is its perimeter?

Correct answer:

p =  49.4347 cm

Step-by-step explanation:

a=21 cm c=10 cm S=92 cm2  S=a+c2h  h=2 S/(a+c)=2 92/(21+10)=184315.9355 cm b=h=5.9355=184315.9355 cm  d=(ac)2+b2=(2110)2+5.9355212.4992 cm  p=a+b+c+d=21+5.9355+10+12.4992=49.4347 cm



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