Question

En la figura calcular "a + b + c + d + e + f"

Answer 1

$a + b + x = 180 \\ x = 180 - a - b$

$c + d + y = 180 \\ y = 180 - c - d$

$f + e + z = 180 \\ z = 180 - f - e$

$x + y + z = 180 \\ 180 - a - b + 180 - c - d + 180 - f - e = 180 \\ 540 - a - b - c - d - f - e = 180 \\ 540 - 180 = a + b + c + d + e + f$