Perpendicular
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A surface that is 90 degrees to a horizontal surface is known as a vertical surface. In geometry, a vertical surface is perpendicular to a horizontal surface, creating a right angle between the two surfaces. This relationship is commonly seen in architectural structures, where walls are often perpendicular to the ground.
It is called a right angle.
On a 2-dimensional plane surface, the answer is NO!!!! The sum of the three angles is ALWAYS 180 degrees. However, when drawn on a 3-dimensional surface, such as sphere, then YES. Taking the Earth as an example, from the North Pole draw two meridians, 90 degrees apart. Carry these meridians to the Equator. Both these meridians will intersect the Equator at 90 degrees. Hence The triangle will have three(3) 90 degrees angles. Equals 270 degrees.
90 degrees 90 degrees
90 degrees...
It is: 90-83.5 = 6.5 degrees