joan decided to use her calculator to find the sum of the first 15 counting numbers instead of the formula. By mistake she entered 16 numbers. She entered one number twice . Her answer was 4 more than a perfect square number. Which number did joan enter twice?
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The third angle must be 60 degrees so it is a scalene triangle
As the third angle must be 42 degrees, it is a scalene triangle.
If you have the other two angles, you can subract them from 180 degrees, which is the sum of the angles in any triangle.
The third angle measures 85⁰ (20 + 75 + 85 = 180) consequently, the triangle is an acute angled scalene triangle
A scalene triangle is a triangle in which all three sides have different lengths. The difference between a scalene right triangle and a scalene obtuse triangle is that in the first one, we can find the measure length of the third side when we know the lengths of the two other sides, and in the second one we cannot.