Acute
180 > x > 90: obtuse 180: straight 360 > x > 180: reflex
An equilateral triangle, which has 3 angles of 60o.
No. An obtuse angle is just a term to describe an angle greater than 90 degrees and less than 180.
-- an angle that measures 90 degrees -- an angle whose sides are mutually perpendicular
Acute
180 > x > 90: obtuse 180: straight 360 > x > 180: reflex
Each base angle is 62.5 degrees
An equilateral triangle, which has 3 angles of 60o.
The 3rd angle is: 180-55-80 = 45 degrees
It is a triangle, one of whose angles is a right angle.
A right angle triangle contains a 90 degree angle and 2 acute angles.
zero
No. An obtuse angle is just a term to describe an angle greater than 90 degrees and less than 180.
-- an angle that measures 90 degrees -- an angle whose sides are mutually perpendicular
It is the regular equilateral triangle whose each exterior angle is 120 degrees
75,64,53