Since the concert hall is in the shape of a tetrahedron, it has no straight angles and, as a result, no standing waves can occur.
The cephalic axis (or glabella) is strongly widening forward with shallow furrows, the front curving downward to end at an approximate straight angle to the plain of the axis.
The racquet movement is typically used to suggest a straight angle but then play the stroke cross court, or vice versa.
A characteristic property of hyperbolic geometry is that the angles of a triangle add to "less" than a straight angle, or 180.
There are two main underground parallel tunnels of around length, with a 35 m tunnel connecting them at a straight angle.
The roofs of these pavilions were doubly curved gridshells formed entirely of a lattice of straight angle-iron and flat iron bars.
Those whose sum is a straight angle are supplementary.
Even when fully extended (straightened) at the elbow, the forearm did not form a straight angle, falling short of this by 22.
