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# 3/15 Bell Ringer - PowerPoint PPT Presentation

3/15 Bell Ringer. 6. Homework: pg 493 #1 – 6,9,11. √3. y. x. 12. These two triangles are similar. Use a proportion to solve for x and y:. Grab a bell ringer sheet from the front of the room!. 60 °. 1. 3/15 Agenda. I CAN find missing sides of 45-45-90 and 30-60-90 Triangles.

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### 3/15 Bell Ringer

6

Homework: pg 493 #1 – 6,9,11

√3

y

x

12

These two triangles are similar. Use a proportion to solve for x and y:

Grab a bell ringer sheet from the front of the room!

60°

1

• I CAN find missing sides of 45-45-90 and 30-60-90 Triangles.

• 1. Bell Ringer

• 2. Why is this a shortcut?

• 3. Two examples to figure all of this out.

• 4. Fix it up!

• 5. ACT Question of the Day

• Mr. Chrischilles’ Clicker

• Perfection Award: 3rd Period

• Hand in Bell Ringers from last week if you didn’t turn them in on Friday.

• Hand in Hawkeye Makeup if you did it.

• Where does 5√2 come from?

• Let’s assume we want to find c if a and b = 5.

• Pythagorean Theorem: a2+b2=c2

• 52 + 52 = c2

• 25 + 25 = c2

• 50 = c2

• C = √50

6

45°

• What type of triangle is it?

• 45-45-90

• What do we know?

Hyp = Leg x √2

C = a√2

Leg (a) = 6

• Find out:

C = 6√2

• What if we knew c and wanted to find the legs?

6

C

45°

Example #2

60°

B

C

• What type of triangle is it?

30-60-90

• What do we know?

C = 2a

B = a√3

a = 3

• Find out:

C = 2(3) = 6

B = 3√3

• What if you only knew that c = 6. How would you find a and b?

30°

• If you were not here Friday, work on the 30-60-90 Independent Practice first, then check your 45-45-90 IP.

• If you didn’t finish one of the Independent Practices, finish it now.

• If you finished both, check your work, making sure you didn’t write answers as decimals.

• If you finish all of this, get the bonus sheet from the front of the room and work on it

• ALL WORK WILL BE HANDED IN AT THE END OF CLASS AND WILL BE GRADED FOR ACCURACY!!!

• Find the value of x:

• A. 2

• B. 4√3

• C. 4√2

• D. 8

• E. 2√3

x

60°

4

30°

New grades are posted, check yours

Homework: pg 493 #1 – 6,9,11