Respuesta :

Vroomie
The total angle sum of a triangle is 180°
As such, 180= 78 + 2s +4s
102= 6s
s=17
XxAtomicxX

Step-by-step explanation:

2s+4s+78=180

6s=180-78

s=102/6

s=39.54

hope this helps you

have a nice day