angles by mr. bales objective by the end of this lesson, you will be able to identify, describe, and...
TRANSCRIPT
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Angles
By Mr. Bales
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Objective
By the end of this lesson, you will be able to identify, describe, and classify angles.Standard 4MG3.5 - Students need to know the definitions of a right angle, an acute angle, and an obtuse angle. Understand that 90°, 180°, 270°, and 360° are associated respectively, with 1/4, 1/2, 3/4, and full turns.
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Turns
How many degrees does it take to go in a complete circle? Or make one full turn?Let’s watch a little NBA to find out!!NBASo, how many degrees are there in a full turn?
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History LessonThe Babylonians in about 2400 B.C. lived in Mesopotamia, now southern Iraq. They used a number system based on 60. Some believe they divided the circle into 360 degrees because 6 x 60 = 360 degrees. Others believed that they watched the planets and the sun. They knew it took 360 days for the sun’s path to complete a total circuit. Either way, that is how we got the 360 degree circle.
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Get Ready to Learn
MJ’s teacher (that’s me) assigned ten problems for homework. MJ started his homework at 4:00 p.m. He completed it at 4:15 p.m. How far has the minute hand turned?Use the following pictures to help you solve the problem.
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More on Turns
90°¼ turn
270°
¾ turn
180°1/2 turn
full turn
360°
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ActivityLet’s get on our feet and practice this!!Please stand and face the board, which is 12:00.Turn 1/4 turn.What angle measure is that?Turn 1/2 turn.What angle measure is that?Turn 3/4 turn.What angle measure is that?Turn a full turn.What angle measure is that?
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What are Angles?
Angles are figures that are formed by two rays or two line segments with a common endpoint.You label angles with a < symbol and you place the vertex in the middle of the three points.
Always label angles with vertex in the middle!
A
B
C
How would you label this Daniella?
Perfect! < ABC or < CBA
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Right Angles
There are all kinds of different angles.A right angle has a “square corner”.
UT
SCan you label this correctly?
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Acute Angles
An acute angle measures greater than 0º and less than 90º.
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Obtuse Angles
An obtuse angle measures greater than 90º, but less than 180º.
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More on Angles
Let’s hear from Mr. Hardesty as he explains a few different angles.Mr. Hardesty!!
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Bales Bucks!!!
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Assignment
Page 400 - #’s 8 - 19Get them all correct, No Math Homework