st3v3nb3
st3v3nb3
28-11-2020
Mathematics
contestada
What is the measure of angle A?
Respuesta :
JennyTheBest813
JennyTheBest813
28-11-2020
Answer:
∠A=65º
Step-by-step explanation:
A angle of a line is 180º, so we can say that angle ABC=(180-6x)º
The interior angkes of a triangle is 180º, so (x+40)º+(3x+10)º+(180-6x)º=180º
Remove parenthesis, x+40+3x+10+180-6x=180
Combine like terms, -2x+230=180
Subtract 180, -2x=-50
Divide by -2, so x=25
Now:
∠CAB=(25+40)º=65º
∠ABC=[180-6(25)]º=30º
∠BCA=[3(25)+10]=85º
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