A regular tetrahedron (an equilateral triangular pyramid).
Chat with our AI personalities
6 faces 1o edges and 8 corners
It has to be 90 degrees and yes, straight.
a right angle is half of a straight angle
A straight angle is an angle that is 180 degrees exactly (a straight line). A right angle is 90 degrees (like the corners of a square.)
A right angle because 180* - 90* is 90* which is a right angle !