Scientific method.
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the formula for a circle is A=(pi)r^2. so you would fill in wat you no and then ur formula would be A=(pi)8^2. u then solve ur the problem by order of operations so u would do exponents first. A=(pi)64. it depends on wat u use for PI but if u use 3.14 then the answer would be 200.96.
Yes, absolutely
Since the Pythagorean theorem has 3 variables (the 3 sides), and you only know one variable, you cannot use it to solve for the other 2 variables. Do you know any other information (like angles)? that can be used to solve the triangle (you would not be using the Pythagorean theorem, though). Did they mark the 2 legs with little 'tick marks' denoting that they are equal? Then you could use the Pythagorean theorem because then you know 2 varaibles, and you can solve for the third variable.
When solving a math problem
pascals triangle is used to solve math problems that have chance of 2 different outcomes, such as flipping a coin