Pythagoras

2. The sum of the angles of a triangle

3. X=40
Z=70
Y=?

4. Pythagorean theorem
is a relation in Euclidean geometry among the three sides of
a right triangle. It states that the square of
the hypotenuse (the side opposite the right angle) is equal
to the sum of the squares of the other two sides

6. Arithmetic Average or Arithmetic Mean
is the sum of a collection of numbers divided by the number of
numbers in the collection

7. Calculate arithmetic average
2 4 5 6 8 9 11 13 23

8. Dictionary
Angle - kąt
Triangle – trójkąt
Hypotenuse – przeciwprostokątna
Divide - podzielić
Average/mean - średnia