Question

if one angle of a triangle is equal to the sum of the two other angles show that the triangle is right angled

Answer 1

let the angles of a triangle be A,B nd C
A+B+C=180°
A+B=C
so
C+C=180°
2C=180°
C=90°
So the triangle is right angled triangle

PLZ MARK AS BRAINLIEST

Answer 2

sum of all angle of triangle= 180°
X+X+2X= 180°
4X =180
X= 180/4
X= 45°
therefore first angle = 45°.
second angle = 45°
and third angle = 2X = 2×45= 90°
If 90° is formed then it is right angle triangle