1. Cell phone use is prohibited.
Students:
Today is a red light day.
Cell phone use is prohibited.
This is your warning.

2. 1 , 4 , 9 , 16 , 25 , 36 , 49 , 64 , 81 , 100 , …
Simplify the following radicals. 1) 2) 3) 4) 5)

3. 13.02 The Pythagorean Theorem

4. The Pythagorean Theorem states:c a b
We can use the Pythagorean Theorem to find a missing side of a right triangle.
The Pythagorean Theorem states:
The square of the hypotenuse is equal to the sum of the squares of the legs.
c 2 = a 2 + b 2 or
a 2 + b 2 = c 2

5. c 2 = a 2 + b 2 If a = 6 and b = 8, find c. c2 = 62 + 82 c2 = 36 + 64

6. a 2 + b 2 = c 2 If a = 8 and c = 17, find b. 82 + b2 = 172

7. c 2 = a 2 + b 2 If a = 4 and b = 6, find c. c2 = 42 + 62 c2 = 16 + 36

8. A 20 ft. ladder is leaning against a building. If the ladder is 12 ft
A 20 ft. ladder is leaning against a building. If the ladder is 12 ft. away from the building, how tall is the building?
h = 202 20 h
h = 400
h2 = 256 12
h = 16

9. If AB = 10 , AC = 8 , CD = 15, find the perimeter of Δ ABD.17 10 8 B 6 C 15 D
If AB = 10 , AC = 8 , CD = 15, find the perimeter of Δ ABD.
(BC) = 102
(AD)2 =
(BC) = 100
(AD)2 =
(BC)2 = 36
(AD)2 = 289
BC = 6
AD = 17
Perimeter of Δ ABD =
= 48