Building Construction
Depth or height of the arch is the

Perpendicular distance between intrados and extrados
Vertical distance between springing line and intrados
None of these
Perpendicular distance between springing line and extrados

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Building Construction
Mansard roof is a roof which slopes in

Four directions without break in the slope on each side
Four directions with break in the slope on each side
Two directions without break in the slope on each side
Two directions with break in the slope on each side

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