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The three angles are 40, 50 and 90 degrees.
10 degrees less than a right angle
NO!!! Equilateral ; All angles acute (60 degrees) ; all sides the same length Isosceles ; Two angles are equal, the third angle may be acute or obtuse ; two sides are equal , third side unequal Right- Angles Triangle ; Maybe Isoscles , but MUST have one right angle(90 degrees) Scalene ; All angles are different, may be obtuse ; All sides are different. NB Any angle less than 90 degrees is Acute Any angle greater than 90 degrees but less than 180 degrees is Obtuse Any angle greater than 180 degrees (- 360 degrees) is Reflex.
The exterior angle is given by 360 / 10 = 36 degrees. The interior angle is given by 180 - the interior angle, ie 180 - 36 = 144 degrees.
Each interor angle will measure 144 degrees So the 10 interior angles will add up to 1440 degrees