### AC Lim's answer to Stressful's Primary 5 Maths Area & Volume Singapore question.

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Hope this helps

Date Posted:
1 week ago

But I got C + D by assuming height of C is U.

C+D = (1/2 x 12 x u) + (1/2 x 12 x (8-u))

C+D = 6u + 48 - 6u

C+D = 48

Shaded Area = Rectangle - A - B - C - D = 120 - 48 - 12 - 12 = 48

C+D = E+F is derive from what you've done by assume height of C=u.

Since primary school may not learn solution for 6(8-u). I have upload another method to prove C+D = E+F.