The IV one. PLEASE!
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Let base angles be x
Given vertex angle = 2x
We know sum of angles of triangle is 180degrees
Then
2x+x+x=180
4x=180
x=45degrees
Base angles are 45 each
And vertex angle is 2x45=90 degrees
Given vertex angle = 2x
We know sum of angles of triangle is 180degrees
Then
2x+x+x=180
4x=180
x=45degrees
Base angles are 45 each
And vertex angle is 2x45=90 degrees
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