The document summarizes the Pythagorean theorem, which states that in a right triangle, the sum of the squares of the two sides forming the right angle equals the square of the hypotenuse. It provides an example of using the theorem to solve the ladder problem, where given the length of a ladder and its distance from a house, it can calculate the height of the window the ladder reaches. The document explains right triangles have three sides - the hypotenuse and two legs - and provides the formula a2 + b2 = c2, where a and b are the legs and c is the hypotenuse.
2. Right Triangles
? Longest side is the
hypotenuse, side c
(opposite the 90o
angle)
? The other two sides
are the legs, sides a
and b
? Pythagoras developed
a formula for finding
the length of the sides
of any right triangle
3. The Pythagorean Theorem
¡°For any right
triangle, the sum of
the areas of the two
small squares is equal
to the area of the
larger.¡±
a2 + b2 = c2
5. Ladder Problem
A ladder leans against
a second-story window
of a house.
If the ladder is 25
meters long,
and the base of the
ladder is 7 meters
from the house,
how high is the
window?
6. Ladder Problem
Solution
? First draw a diagram
that shows the sides
of the right triangle.
? Label the sides:
¨C Ladder is 25 m
¨C Distance from house
is 7 m
? Use a2 + b2 = c2 to
solve for the missing
side. Distance from house: 7 meters
7. Ladder Problem
Solution
72 + b2 = 252
49 + b2 = 625
b2 = 576
b = 24 m
How did you do?
A=7m
