Workout

Question 1:

(a)    24cm²             (b)   150cm²            (c)   294mm²

Question 2:

(a)   76cm²              (b)   86cm²              (c)   810cm²

(d)   64cm²              (e)   37cm²              (f)  868cm²

(g)   292.2cm²         (h)   484mm²           (i)   34500cm²

Question 3:  864cm²

Question 4:  1.5cm²

Apply

Question 1:   x = 3cm

Question 2:   Cuboid B has the lowest surface area (440cm²)

Question 3:  600cm²

Question 4:   He has only considered the top, front and right hand side, not the bottom, back and left hand side. So he needs to multiply his answer by 2. Also the units should be cm²

Question 5: (a)  8cm          (b)  17cm       (c)  1.5cm