It is: 12+5 = 17 cm
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The area of rectangle is : 60.0
30 sq cm ((12 x 5)/2)
330 cm3 Volume = area_of_end x length = (1/2 x 12 cm x 5 cm) x 11 cm = 330 cm3
1/2*(12+8)*5 = 50 square cm
15 cm long and 5 cm wide is pretty nearly 15 cm long.