it is a scalene triangle
it is right angled isosceles triangle
it is an equilateral triangle
It is an isosceles triangle but not right angled
Correct answer is C
(x + 10)o + (2x - 40)o + (3x - 90)o = 180
6x - 120 = 180
6x = 180 + 120
6x = 300
x = 3006
x = 50
x + 10o = 50o + 10o = 60o
2x - 40 = 2(50o) - 40 = 60o
3x - 90 = 3(50o) - 90o = 60o
Hence, it is an equilateral triangle
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