Question

perimeter of a trapezium is 68cm and its non parallel sides are 12cm each and its altitude is 4cm.find its area

Answer 1

Perimeter of trapezium= a+b+c+d= 68 cm
a+c=12+12= 24  cm, then b+d=68-24= 44 cm
Area of trapezium
= 1/2 x (a+b) x height= 1/2 x (12+22) x 4=1/2 x 34 x 4 = 68 sq.cm

Answer 2

1/2(sum of !!   sides  ) *height
  
12*2 +y= 68  , y=44

x=44-8 root 2 =32.68 (sum of !! sides

1/2*36.8*4=65.2 cm2