Please help me with this problem.
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Sum of all angles in a triangle = 180°
In the right angled triangle
90° + 78° + x = 180°
x = 12°
Now,
Angle1 + 12° = 180°
Angle1 = 168°
[See 1st image attached]
__________
ALTERNATIVE METHOD
Exetrior angle = Sum of opposite interior angles
Angle1 = 90° + 78° = 168°
An example of this alternative method is in the 2nd image attached.
In the right angled triangle
90° + 78° + x = 180°
x = 12°
Now,
Angle1 + 12° = 180°
Angle1 = 168°
[See 1st image attached]
__________
ALTERNATIVE METHOD
Exetrior angle = Sum of opposite interior angles
Angle1 = 90° + 78° = 168°
An example of this alternative method is in the 2nd image attached.
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Thegeek232:
where does 12 come from?
so 78+90=168 and 168+12=180 but where does the 90 come in?
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