What is the radius of the circle $x^{2} + y^{2} - 4 x + 6 y - 3 = 0$ ?

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A right triangle has legs $5$ and $12$ . How long is the hypotenuse?
Two angles of a triangle are $5 0^{\circ}$ and $6 0^{\circ}$ . What is the third angle?
In a right triangle with hypotenuse $10$ and an angle of $3 0^{\circ}$ , how long is the side opposite that angle?
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What is the dot product $a \cdot b$ for $a = (2, 3)$ and $b = (- 1, 4)$ ?