Question

Son líneas notables ayudenme por favor ​

Answer 1

Con formula:

$15 = \frac{x}{2} \\ 15 \times 2 = x \\ 30 = x$

Sin formula:

$θ + 15 = \beta \\ 15 = \beta - θ$

$x + 2θ = 2 \beta \\ x = 2 \beta - 2θ \\ x = 2( \beta - θ) \\ x = 2 \times 15 \\ x = 30$