Everything about Right Angle totally explained
In
geometry and
trigonometry, a
right angle is an angle of 90
degrees, corresponding to a quarter turn (that is, a quarter of a full circle). It can be defined as the
angle such that twice that angle amounts to a half turn, or 180° .
Lines that are at a right angle to each other are
perpendicular, an important geometrical property. The presence of a right angle in a
triangle is the defining factor for
right triangles.
A right angle may be expressed in different units:
- 90°
- π/2 radians
- 100 grad (also called grade, gradian, or gon)
- 8 points (of a 32-point compass rose)
- 6 hours (astronomical hour angle)
- ∞% grade on the tangent scale
- 100% grade on the sine scale.
The term is a
calque of
Latin angulus rectus; here
rectus means "upright", referring to the vertical perpendicular to a horizontal base line.
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