Respuesta :

breadsticksandcheese

Answer:

36°

Step-by-step explanation:

all the interior angles of a triangle add up to 180°

78 + 66 = 144

180 - 144 = 36°

bebo1617

Answer:

sum of all the sides of a triangle= 180°

78°+66°+x = 180°

x = 180° - (78° + 66°)

= 180° - 144°

= 36°

x = 36°

Ans. = the value of x is 36°.

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