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Ket [755]
3 years ago
12

I need help with this ^

Mathematics
1 answer:
Sauron [17]3 years ago
3 0

Answer:

a=45º

Step-by-step explanation:

The angles in a triangle added up= 180º

so, we can make the equation:

2a-20+2a-20+a-5=180

simplify

5a-45=180

5a=225

a=45

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