A spiral staircase is an example as :

Inclined plane

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Plane

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Slope

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Both A and C

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Solution

The correct option is D Both A and C
As seen in the image above, spiral staircase is both an inclined plane (i.e it makes and angle other than 90x, x being an integer with the horizontal) and has a slope.

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A spiral staircase is an example as :

The correct option is D Both A and CAs seen in the image above, spiral staircase is both an inclined plane (i.e it makes and angle other than 90x, x being an integer with the horizontal) and has a slope.

The correct option is D Both A and C
As seen in the image above, spiral staircase is both an inclined plane (i.e it makes and angle other than 90x, x being an integer with the horizontal) and has a slope.