Question:
Directions : Find out the total number of surfaces of the object, given below in the problem figure.
Directions : Find out the total number of surfaces of the object, given below in the problem figure.
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Count each tread (top face), each riser and side wall, the notch and sloping faces, and then the hidden back and base faces.
Updated On: Nov 12, 2026
- 15
- 16
- 14
- 13
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The Correct Option is A
Solution and Explanation
The figure shows a staircase of two steps rising towards the back, with a notched block at the rear and an inclined (sloping) wall on the right.
Take the object as a solid and count every separate plane surface: the horizontal top faces at each level, the vertical walls facing left-front and right-front, any slanted or recessed faces, and the surfaces that cannot be seen from this viewpoint (the back-facing walls and the base).
Adding the visible and the hidden surfaces gives 15 in total.
Answer: (1) 15
Take the object as a solid and count every separate plane surface: the horizontal top faces at each level, the vertical walls facing left-front and right-front, any slanted or recessed faces, and the surfaces that cannot be seen from this viewpoint (the back-facing walls and the base).
Adding the visible and the hidden surfaces gives 15 in total.
Answer: (1) 15
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