Answer:
Step-by-step explanation:
Answer:
The side lengths cannot belong to a right triangle.
Step-by-step explanation:
This is a simple case of Pythagorean proof. If this triangle was a right triangle, 20^2 + 21^2 = 28^2. However, this is not the case. 20^2 + 21^2 = 841, which square root is 29.
If you forgot, the Pythagoren Theorem is: a^2 + b^2 = c^2.
Hope this helps!
Answer:
138
Step-by-step explanation:
Given :
We know the identity
We use this property to simplify the left hand side
So
we know ,
when then
For
Add on both sides
Finally we add 2npi for general solution
So options C and D are correct