qjin27

I think you subtract, not add

You can just assume i as a variable, because you can't really do anything with it

S=$\boxed{1,2}$

Just draw a graph using paper and you will find it

we want to find all 3 sides so we can use to circumradius formula, so AD=8 and AC=8√2. Because CDB is a 30 60 90 triangle so CB=16 and finally DB=8√3. We find that AB=8+8√3. The circumradius is $\boxed{8\sqrt2}$

hmmm, this is one of the questions from my thingy

The probability of the first one drawn black is $\frac{6}{9}=\frac{2}{3}$ . The probability that you draw the second one black is $\frac{5}{8}$. So the probability that both of them are black is $\frac{2}{3}\cdot\frac{5}{8}=\boxed{\frac{5}{12}}$

1287.975

You can divide this into 2 equilateral triangles. The formula for area of a equilateral triangle is $​​​​\sqrt3/4\cdot(a^2)$ so its 16√3 +16√3, which equals to $\boxed{32\sqrt3}$

A rational number is a number that can be expressed as a fraction. If it cannot be expressed as a fraction then it is irrational, like pi, there are fractions that come close to pi, like 22/7 but nothing that is pi exactly.

this has already been answered here

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https://web2.0calc.com/questions/help-with-cone