Algebra 1a: CST Review
Square Roots: The `sqrt(25) = 5`.
The `sqrt(5)` can be approximated as somewhere between the `sqrt(4)` and the `sqrt(9)`.
`sqrt(9)=3`
`sqrt(5) = ?`
`sqrt(4)=2`, so `sqrt(5)` is closer to `sqrt(4)` than `sqrt(9)`. A good guess could be 2.2?
Pythagorean Theorem: Only works for right – triangles. The 3 sides of the triangle are `a`, `b`, and `c`. `a` and `b` are the short sides and `c`, the side OPPOSITE the right angle is called the hypotenuse.
The theorem states:
`c^2= a^2 + b^2` (if you know the 2 smaller sides, `a` and `b`)
or
`a^2 = c^2 – b^2` (if you know the hypotenuse, `c` and side `b`)
or
`b^2 = c^2 – a^2` (if you know the hypotenuse, `c` and side `a`)