Question

Value of x and how?Explain...​

Answer 1

Answer:

70 = 45 + x

70-45= x

x = 25

since the external angle = sum of two sides of internal angles.

Thank You

Answer 2

Answer:

By using the straight angle property

$< bca + < fca = 180$

$< bca + 70 = 180$

$< bca = 110$

we know that sum of angles in triangle is 180.