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Step-by-step explanation:
Answer:
360
Step-by-step explanation:
exterior angle = sum of two opposite interior angles
let say a b c are internal angles
then x = a+b
y = b+c
z = c+a
adding all three
x + y + z = 2*(a+ b +c)
sum of interior angles of s triangle = 180 deg
= 2 * (180)
= 360 deg