a box is in the form of a cuboid whose external measures are 50 cm * 40 cm * 25cm .the base ,the side faces and back face are to be painted black . find the area to be painted.
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Given : a box is in the form of a cuboid whose external measures are 50 cm * 40 cm * 25cm .
the base ,the side faces and back face are to be painted black .
To find : the area to be painted.
Solution:
l = 50 cm
b = 40 cm
h = 25 cm
the base ,the side faces and back face
base = l * b = 50 * 40 = 2000 cm²
Side faces = 2 * b * h = 2 * 40 * 25 = 2000 cm²
back face = l * h = 50 * 25 = 1250 cm²
Total area = 2000 + 2000 + 1250
= 5250 cm²
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