1. ´
Matematica - Ensino Fundamental
Exerc´
ıcios - Lista 4 - 8o. Ano
Exerc´ıcios sobre equa¸oes de 1o. grau em quest˜es de geometria:
c˜ o
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retas concorrentes; ˆngulos alternos .
a
Exerc´
ıcios:
1) O paralelogramo possui lados opostos paralelos. Indique quais os angulos internos do
ˆ
ˆ = x; z = y .
paralelogramo s˜o iguais. Dica: A ˆ ˆ ˆ
a
2) Qual o valor das inc´gnitas em cada caso?
o
a)
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na categoria de Matem´tica do Ensino Fundamental.
a
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2. b)
c)
d)
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3. 3) Determine o valor de cada inc´gnita, sabendo que as retas horizontais s˜o paralelas
o a
entre si.
a)
c)
d)
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4. Respostas:
ˆ ˆ ˆ ˆ
1) A = D; B = C.
2)
a) x = 130◦ ; y = 50◦ ; z = 130◦ .
b) x = 10◦ .
c) x = 20◦ .
d) x = 25◦ ; y = 90◦ ; z = 65◦ ; w = 115◦ .
3)
a) x = 2.
b) x = 40.
c) x = 10; y = 30.
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5. c 2012 Christine C´rdula Dantas
o
Copyright notice: Christine C´rdula Dantas is the author of “Matem´tica - Ensino Fun-
o a
damental - Lista 4 - 8o. Ano”and reserves all rights to this work, in all forms, including but
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Materials Division (AMR-C)
Institute of Aeronautics and Space (IAE)
Department of Science and Aerospace Technology (DCTA)
P¸a. Mal. Eduardo Gomes, 50
c
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a
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a e
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