Question

Sabendo que os ângulos a seguir são complementares, qual é o valor de x?

a) x=15°

b)x=10°

c) x=20°

d)x=5°​

Answer 1

$\Box \ \ \boxed{\begin{array}{l}\sf x+5+x+10+x+15+x+20=90 \end{array}}\\\Box \ \ \boxed{\begin{array}{l}\sf 4x+50=90 \end{array}}\\\Box \ \ \boxed{\begin{array}{l}\sf 4x=90-50 \end{array}}\\\Box \ \ \boxed{\begin{array}{l}\sf 4x=40 \end{array}}\\\Box \ \ \boxed{\begin{array}{l}\sf x=\frac{40}{4} \end{array}}\\\Box \ \ \boxed{\begin{array}{l}\sf x=10 \end{array}}$

Resposta correta;

alternativa b) x = 10°