Simplify the following text for a Grade 4 native English-speaking person.
Original: In any right triangle , the area of the square whose side is the hypotenuse ( the side opposite the right angle ) is equal to the sum of the areas of the squares whose sides are the two legs ( the two sides that meet at a right angle ) .
Simplified: This angle is the right angle . The two sides next to the right angle are called the legs and the other side is called the hypotenuse .