Building Construction
A pointed arch which forms isosceles or equilateral triangle, is generally known as

Bull's eye arch
Three centered arch
Two centered arch
Lancet arch

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Building Construction
In a colar beam roof

There is a horizontal tie at almost the middle of rafters only
There is no horizontal tie beam
There is a horizontal tie at the feet of rafters only
There are two horizontal ties, one at the feet and other at the middle of the rafters

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