Answer:
A=81
Step-by-step explanation:
the first bullet is harder, but stuff you'll need to know eventually. The second bullet is SUPER simple.
a²+b²=c².
- One way you can do it; we know that c²=225, so find the square root of that. (it's 15). we also know that either a² or b² is 144. so now we square root that. (its 12). so we know that 15²-12²=b². or that 15²-12²=b². it doesn't matter if it's a or b. pick whichever one you want. plug one if the equations in, and you'll get 81.
- Second way you can do it, which is easier. 225-144=81. this is the same as above, but skipping steps. good for simple math, but later on with harder math it might make things confusing.
