Definition
right angle
Right angles measure 90 degrees.
what is a right angle
90`
right angle
(Hypotenuse)2 = (Base)2< + (Altitude)2.
acute angle
Acute angles measure less than 90 degrees
what is acute angle
less then 90`
acute
∠A + ∠B + ∠C = 180°.
obtuse angle
Obtuse angles measure more than 90 degrees.
Obtuse Angles
an angle that measures more than 90 degrees and less than 180 degrees
obtuse
cos θ = −cos (180° − θ), where 90° < θ < 180°.
straight angle
Straight Angles
an angle whose sides lie in opposite directions from the vertex in the same straight line and which equals two right angles.
straight
(90∘+90∘=180∘ 90 ∘ + 90 ∘ = 180 ∘ ).
full ration
they always equal 360
Full Rotation
360 degrees
full ration
1 revolution = 2πrad = 360°.