A MYSTERIOUS triangular shape has been spotted in an Area 51 hangar just months before spy agencies are set to reveal UFO secrets. Pictures, captured by private pilot Gabe Zeifman, shows a black, ...
A triangle is a polygon. It is a closed 3-sided shape made up of straight lines. The ‘tri-’ part of the word triangle means three. A triangle has 3 sides and 3 angles. Interior angles are the angles ...
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