Answer:
The pendentive allows the support of the circular base of a dome over a square or polygonal space. In a nutshell, it avoids the dome to fall out.
Explanation:
The pendentives, which are triangular segments of a sphere, taper into points at the bottom and spread at the top to establish the continuous circular or elliptical base necessary for a dome. The pendentives were mainly used in Renaissance and Baroque architecture. The first experiment with the use of pendants was carried out in Roman domed buildings in the early 2nd and 3rd centuries.
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Answer:
One World Trade Center (WTC 1, or the North Tower) was hit at 8:46 a.m. Eastern time and collapsed at 10:28 a.m. Two World Trade Center (WTC 2, or the South Tower) was hit at 9:03 a.m. and collapsed at 9:59 a.m.
How long did it take for the south tower to collapse?
56 minutes
9:57: The passengers aboard Flight 93 begin a revolt against the hijackers in an attempt to take back the plane. 9:59:00: The South Tower of the World Trade Center collapses, 56 minutes after the impact of Flight 175.
