Question

alguem me ajuda se eu tiver resolvida essa consigo resolver as outras

Answer 1

veja

catetos x e x

tg=co/ca

$tg \beta = \frac{x}{x} =1$

$\beta =45$

$tg45=1$

b)
$tg\widehat{A}=tg \beta$

$\frac{x}{x} = \frac{x}{x}$

$1=1$