This module contains the concept of Principal Roots and how to determine whether
it is rational or irrational.
Let’s explore!
You have learned to use the length of a side of a square to find the area. You can use
this area to find the length of a side.

The square shown on the right has a side 1 unit
long. Its area is 1 square unit.

1. Make a square with area of 4 square units on
the grid. What is the length of the side?

2. Make a square with area of 9 square units on
the grid. What is the length of the side?

3. Make a square of an area of 2 square units.
a. How do you know that the area of the
square you have done is 2 square units?
b. How do you know that the figure you
drew is a square?
c. Estimate the length of a side of the square.

Try this!
Using a scientific calculator (or your android phone), input the following and get the
equivalent value.

1. √36 = ____ 3. √2 = ____ 5. √81 = ____
2. √64 = ____ 4. √50 = ____ 6. √75 = ____ kaya niyo yan!