The nest step is to Construct the altitude from the incenter to a side of the triangle and label the intersection point. (: but next time I'd highly recommend (if you can) add an attachment describing your question, hope this is helpful though.
Since

you can see that common expression is

.
Answer: Correct choice is A.
Answer:
NEITHER I THINK
Step-by-step explanation:
Answer:
Really
Step-by-step explanation:
Answer:
what is the question ? Volume or surface area???