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Elementary Geometry for College St...
Solutions
Elementary Geometry for College St...
In Exercises 45 to 47, write a formal proof for each corollary.
Use an indirect proof to establish the following theorem:
A triangle cannot have more than one right angle.
To prove:
A triangle cannot have more than one right angle.
Approach:
The sum of the three angles in a triangle is
Calculation:
Consider a triangle as
Assume, a triangle has two right angles;
Figure
Calculate the angles of a triangle.
Substitute
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