Answer shown and explanation above! Hope this helps!
Answer:
The given triangle is NOT A RIGHT ANGLED triangle.
Step-by-step explanation:
Here, the given three sides of the triangle are: 11 , 15 and 20.
A. To check if the given triangle is RIGHT ANGLED or NOT
Here, the longest side = 20
So, he hypotenuse = 20
Now, if the given triangle a right angled then by PYTHAGORAS THEOREM
This is a CONTRADICTION as, 400 ≠ 346
Hence the given triangle is NOT A RIGHT ANGLED triangle.
Now, we CAN NOT decide if the triangle is an Acute or Obtuse angled with the help of given sides.
For that classification, ANGLES SHOULD BE KNOWN.
Check the attached file for the answer.
Answer:
A of the shaded figure is 112.5