straight angles
Half-rotation geometric measures
A straight angle is an angle of exactly 180 degrees—forming a straight line rather than a bend.
The term appears mainly in geometry instruction, where students learn the progression from acute to right to obtuse to straight angles.
When the hands of a clock point to 3 and 9, they form a straight angle.
- degreesUnits of measurement
- orientationsPositional alignments or inclinations
- vertexPoint where edges converge
- line segmentBounded straight path
- collinearOn the same line
parallel lines · rectangles · plane geometry · magnitude · straightedge · planes · flats · mathematics · protractor · postulates · math homework · line · axis · intersection · symmetry · drafting · congruence · proof
straight anglesacute angles
Measures below ninety degrees
obtuse angles · right angles · acute · obtuse · sharp angles
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