John bought a laptop for 1,500 the value of this laptop decreases at a constant rate of 18% per year what does the expression 15
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The <em>total</em> area of all six faces of the tunnel is square centimeters.
The surface area of the solid () used to represent the tunnel for a toy train is the sum of its six faces (two <em>semicircular</em> sections, inner <em>semicircular</em> arc section, outer <em>semicircular</em> arc section, two rectangles).
We calculate the surface area as following:
The <em>total</em> area of all six faces of the tunnel is square centimeters.
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