Saturday, April 30, 2011

Finding the 2/3 of a right angle

Hi, kids. This e-tivity is about angles. By the end
  • you will be able to find an angle using as benchmarks the right and straight angles,
  • you will learn how to multiply fractions by whole numbers.
Average online time: 15 min
Average offline time time: 10 min

1) DEFINING ANGLES
An angle is the figure formed by two line segments or rays which intersect at a point called vertex. We use degrees (º) to measure the size of an angle.



2) DEFINING OUR BENCHMARKS
For this e-tivity we will use as benchmarks the right angle and the obtuse angle. A right angle has a measure of 90º and a straight angle has a measure of 180º.







3) FINDING THE 2/3 OF A RIGHT ANGLE
METHOD 1
You need to multiply the fraction given by the measure of a right angle.






METHOD 2
2/3 means that I divide the given angle into three parts, and then I take two of them.








ANSWER
The 2/3 of a right angle correspond to 60º.

YOUR TASK
1) Select the angle you will use as benchmark
2) Choose a method
3) Pose a question similar to the one here on this blog entry (you are not allowed to use 1/2)
4) Solve it :)

Post your comment including answers to numerals 1, 2, 3 & 4.
See you around!

21 comments:

  1. Paula RodríguezMay 2, 2011 at 3:04 p.m.

    Method 1. straight angle.

    2/4 x 180 = 2/4 x 180/1 = 360/4 = 90 degrees

    ReplyDelete
  2. Gabriela RodríguezMay 2, 2011 at 3:08 p.m.

    1) right angle
    2) I choose method 1
    3) Find the 5/6 of a right angle
    4) 5/6 x 90 = 5/6 x 90/1 =450/6= 75º

    ReplyDelete
  3. AnonymousMay 2, 2011 at 3:29 p.m.

    My benchmark was 60 and 2/3 of it, is 40 if its wrong tell me in the class!!! :D

    ReplyDelete
  4. AnonymousMay 2, 2011 at 3:29 p.m.

    The one of 60 was by Cralos Ramos

    ReplyDelete
  5. maria alejandraMay 2, 2011 at 4:21 p.m.

    i use method 1 : and the numbers 5/6

    a) it is right angle

    here is the procedure

    d)5/6 x 90 = 5/6 x 90/1 =450/6= 75

    maria alejandra salas millan

    ReplyDelete
  6. Nashla FayadMay 2, 2011 at 4:29 p.m.

    Method 1:
    2/7 x 90 =
    2/7 x 90/1 = 180/7 = 25 5/7

    ReplyDelete
  7. AnonymousMay 2, 2011 at 4:46 p.m.

    1.i choose the method # 1 because is easy.
    2.I also choose the right angle.
    3.Find the 3/6 of the angle that I chooses.

    4.3/6 x 90 = 3/6 x 90/1 = 270/12 = 22 6/10.

    MADE BY: JULIAN ECHEVERRI. 5C

    ReplyDelete
  8. Natalia MirandaMay 2, 2011 at 5:04 p.m.

    1)right angle
    2)method 1
    3)3/5
    4)3/5x90=3/5x90/1=270/5=54°

    ReplyDelete
  9. juliana garcia gomezMay 2, 2011 at 5:58 p.m.

    I choose the method 1 and is:
    4/9x90/1=360/9=40°

    ReplyDelete
  10. andres mendezMay 2, 2011 at 6:04 p.m.

    1)right angle
    2)method 1
    3)4/5
    4)4/5 90: 4/5 90/1: 360/5: 72

    ReplyDelete
  11. maria paula sernaMay 2, 2011 at 6:04 p.m.

    1)straight angle.

    2/4 x 180 = 2/4 x 180/1 = 360/4 = 90 degrees

    2) I choose method 1

    3) Find the 5/6 of a right angle

    4) 5/6 x 90 = 5/6 x 90/1 =450/6= 75º

    by: maria paula serna

    ReplyDelete
  12. AnonymousMay 2, 2011 at 6:19 p.m.

    1) right angle

    2) I choose method 1

    3) Find the 5/6 of a right angle

    4) 5/6 x 90 = 5/6 x 90/1 =450/6= 75º

    BY: Maria Paula Serna

    ReplyDelete
  13. isaacMay 2, 2011 at 6:24 p.m.

    i am isaac i choose method 1
    2/7 x 90 = 2/7 x 90/1 = 180/7 = 25 5/7

    ReplyDelete
  14. AnonymousMay 2, 2011 at 6:28 p.m.

    1/ right angle
    2/ method 1
    3/.3/5
    4/3/5x90/1:270/5:54
    by: Maria Paula Serna 5c

    ReplyDelete
  15. AnonymousMay 2, 2011 at 6:48 p.m.

    Hi miss alethia, this is my answer:
    1)right angle
    2)method 1
    3)2/5
    4)2/5x90=2/5x90/1=180/5=36°

    BY: Sofía Sepúlveda Amaya:)

    ReplyDelete
  16. lourdes manriqueMay 2, 2011 at 7:37 p.m.

    i choose method 1....

    i choose the right angle

    5/6

    and like is an right angle the measurement is of 90 so 90 i need to change it to a fraction.
    90/1 so..... it wil be the procedures ; 5/6x90/1 = 450/6 and i change to a mix number but it dosent give me a mixed number and is an normal number so is 75

    thanks miss lourdes manrique (:

    ReplyDelete
  17. DANIELA PEÑA 5CMay 2, 2011 at 7:37 p.m.

    I choose method 1 and right angle.
    2/6.
    2/6x90/1=180/6=30°.

    ReplyDelete
  18. Yofadhli Ahmed kahirawanMay 2, 2011 at 9:23 p.m.

    1) I use The ''Straight angel'' because its easy to use it for the number 3/4

    2) I choose method number 1 because it's kind of easy

    3) The question i made is : ''Finding the 3/4 of a straight angel''

    4) 3/4 X 180 = 3/4 X 180/1 = 3/1 X 45/1 = 135/1 = 135 degrees

    ReplyDelete
  19. AnonymousMay 3, 2011 at 1:17 a.m.

    1)Right Angle
    2)Method One.
    3) 2/4.
    4)2/4 x 90/1 = 180/4= 45º.

    Daniela Baron.

    ReplyDelete
  20. ValentinaMay 3, 2011 at 12:04 p.m.

    i Choose method 1 and a right angle.
    2/6
    2/6x90/1=180/6=30°.

    ReplyDelete
  21. Estefania OrtegaMay 3, 2011 at 12:12 p.m.

    Right angle.
    I chose method 1.
    3/5 X 90/1= 270/5 = 54º

    ReplyDelete

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