Answer:
60cm³
Step-by-step explanation:
Answer:
d
Step-by-step explanation:
ive had this exac problem before
Answer: 
Step-by-step explanation:
Let the smallest angle be x.
Then, the middle angle is x+30.
The largest angle is 2x+30.
Angles in a triangle add to 180 degrees, so:

So, the angles measure 
Long division is like a bus stop method if you know
so example the set out would be like this
I'd have to say it's A. Please don't blame me if I'm wrong. :)