You guys manage to do the question with this trapezium and
rectangle ? The one which ask u to prove the surface area of the
figure equals to a given eqn? few of my friends said there is an
error with
it? manage to do part(ii) though...
the formula for trapezium is 1/2 (sum of
parallel length) x height.
i forgot about the 1/2 at first. until last 5 min. ^^