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Question:

Rukhsar painted the outside of the cabinet of measure 1m × 2m × 1.5m. How much surface area did she cover if she painted all except the bottom of the cabinet?

Solution:

A cabinet has 6 surfaces including the bottom surface. However, we have to paint only 5 surfaces. So, we have one front and one back surface (2 × 1.5), one left and one right surface (1 × 1.5), and one upper surface (2 × 1). So, the area to be painted is = (2 × (2 × 1.5)) + (2 × (1 × 1.5)) + (2 × 1) = 6 + 3 + 2 = 11 sq. m