Answer:
b = 20 cm.
Step-by-step explanation:
<u>Define and explain:</u>
This is a right triangle, so the Pythagorean Theorem applies.
The Pythagorean Theorem states that the sum of the squared legs will equal the squared length of the hypotenuse.
The legs of a triangle are the sides that form the right angle.
The hypotenuse is the longest side; the hypotenuse is always diagonal from the small square indicating a right angle.
<u>Solve:</u>
<u>Conclude:</u>
Therefore, the length of the unknown side is 20 centimeters.