Homework: 1-6, 9-17 Alg Rev #11 Due Friday

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Presentation transcript:

Homework: 1-6, 9-17 Alg Rev #11 Due Friday For each polygon, find (a) the interior angle sum and (b) the exterior angle sum. Quadrilateral 2. Pentagon 3. Hexagon 4. Octagon 5. Decagon 6. n-gon 360, 360 2. 540,360 3. 720, 360 4. 1080, 360 5. 1440, 360 6. (n-2)180, 360

Homework: 1-6, 9-17 Alg Rev #11 Due Friday Sum of int angles of a pentagon =540 540-270=270 270/2=135 Total =540 540-400=140 Total = 720 720/6=120

Homework: 1-6, 9-17 Alg Rev #11 Due Friday

Homework: 1-6, 9-17 Alg Rev #11 Due Friday 360∙5=𝑠𝑢𝑚 𝑜𝑓 𝑖𝑛𝑡 ∠𝑠 1800=𝑠𝑢𝑚 𝑜𝑓 𝑖𝑛𝑡 ∠𝑠 1800= 𝑛−2 180 10=𝑛−2 𝑛=12 12𝑥=180 𝑥=15 11x=165 (n-2)180 =165(n) 180n-360=165n 15n=360 N=24 x 11x

(hint – use colored pencils!) Finding the Number of Diagonals in a polygon…. (hint – use colored pencils!)

Construct an equilateral triangle.

Construct a Square

FOR FUN! Use the instructions to construct a pentagon!

HW: Page 105, #21 and 22. Page 88 Use the givens for problem 20 to prove ∠1=∠3. Use the given for 21 to prove ∠ 1=∠ 4. Complete 24-31 all.