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In geometry and trigonometry, a right angle is an angle of exactly 90 degrees or ⁠ π/2⁠ radians[1] corresponding to a quarter turn.[2] If a ray is placed so that its endpoint is on a line and the adjacent angles are equal, then they are right angles.[3] 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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https://en.wikipedia.org/wiki/Right_angle

#longcat is long

#caturday #caturdayeveryday

#longcat is long

#caturday #caturdayeveryday

#longcat is long

#caturday #caturdayeveryday