Question

Nos triângulos seguintes, calcule o valor de x

a) a=50°. b=75°

b) a=50°. b=76°

c) a=70°. b=76°

d) a=70°. b=74°

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Answer 1

$\Box \ \ \boxed{\begin{array}{l}\sf x+x+x-30=180 \end{array}}\\\Box \ \ \boxed{\begin{array}{l}\sf 3x=180+30 \end{array}}\\\Box \ \ \boxed{\begin{array}{l}\sf 3x=210 \end{array}}\\\Box \ \ \boxed{\begin{array}{l}\sf x=\frac{210}{3} \end{array}}\\\Box \ \ \boxed{\begin{array}{l}\sf x=70 \end{array}}\\\\\\\Box \ \ \boxed{\begin{array}{l}\sf 55+x+49=180 \end{array}}\\\Box \ \ \boxed{\begin{array}{l}\sf x=180-55-49 \end{array}}\\\Box \ \ \boxed{\begin{array}{l}\sf x=76 \end{array}}$

Resposta Correta;

c) a = 70°  e b = 76°