The area of trapezium could be calculated by the formula below The distance between the two parallel sides is the height. a=9.5 and b=10.5 The area, A=36 9.5=9+0.5 10.5=10+0.5 9.5+10.5=9+10+0.5+0.5 0.5= half 0.5+0.5= half + half =1 9.5+10.5=9+10+1=20 36=10×h Divide both sides by 10 36∕10=h 3.6=h