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3 years ago

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Mathematics

1 answer:

lina2011 [118]3 years ago

6 0

EF || AC ==》 180 - 4x = EBC ( ♡ )

_______________________

And also :

ABD = FBC ==》 FBC = x ( ☆ )

_______________________

EBC = EBF + FBC

( ♡ ) , ( ☆ ) :

180 - 4x = 65 + x

Subtract both sides 65

180 - 65 - 4x = 65 - 65 + x

115 - 4x = x

Add both sides 4x

115 - 4x + 4x = x + 4x

115 = 5x

Divide both sides by 5

115 ÷ 5 = 5x ÷ 5

23 = x

And we're done ...

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