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Draw rough sketches for  Ī”XYZ such that YL is an altitude in the exterior of the triangle.

Answer
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Hint: We can draw an altitude in the exterior of a triangle only if it is an obtuse angled triangle. By using this concept we draw the triangle first and then altitude to the exterior of a triangle.

Complete step by step solution:
We have to draw an altitude in the exterior of the  Ī”XYZ 
An altitude can be drawn in the exterior of a triangle only if it is an obtuse angled triangle.
So, we need to draw  Ī”XYZ as an obtuse angled triangle as shown in the figure.
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Altitude (perpendicular line).
 YL= exterior altitude of  Ī”XYZ .
Here,
In figure,  Ī”XYZ is obtuse angled triangle because we can only draw an exterior altitude from abuse angle it can observed that on  Ī”XYZ,YZ is an altitude drawn interior to side  XZ which is extends up to point  L. 

Note: To know whether the altitude will be on the exterior of a triangle or in the interior of a triangle, we need to know the properties of the triangle.
For an acute angled triangle, the altitude will be in the interior of a triangle.
For a right angled triangle, the altitude will be at the angle which is right angled.
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