Bellwork Match the correct word to its definition: 1. RightA. Measure between 90 and 180 degrees. 2.StraightB. Measure equal to 90 degrees 3.AcuteC. Measure.

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Presentation transcript:

Bellwork Match the correct word to its definition: 1. RightA. Measure between 90 and 180 degrees. 2.StraightB. Measure equal to 90 degrees 3.AcuteC. Measure equal to 180 degree 4. ObtuseD. Measure between 0 and 90 degrees If the measure of an obtuse angle is x degrees, what are the restrictions on x? Write this as an inequality statement. After your finished, check your answers with your partner. If you agree, give a knuckle-knock.

1.2 Measurements of Segments and Angles Students will be able to: 1. find the measures of angles and segments. 2. name the parts of a degree. 3. classify angles by size.

Congruent (Defn) Segments that are the same measure are said to be congruent. ( ). C is between A and B. If AB = 10 and BC = 5, what can you conclude about and ?

Angles are measured In degrees With a protractor

Parts of a Degree 60’ = 1 ( 60 minutes equals 1 degree) 60” = 1’ ( 60 seconds equals 1 minute) Thus: 90 = 89 60’ = 89 59’ 60”

Example 1 Change from degrees to degrees and minutes.

Example 2 Change from degrees and minutes to degrees.

Example 3 - Simplify

Example 4 Find the measure of the angle formed by the hands of a clock at 2:30.

Example 5 Given: Find:

Example 6 Solve for r and m. Given: XT = 2r + 5 XS = 3m + 7 YS = 3 ½ r + 2 YT = 4.2m + 5

Ticket to Leave Write 52°12’ in terms of degrees only.

Homework Pg. 14 Draw Pictures for full credit! Five minute rule! # 4 – 6, 8, 9 a, b, 10, 11, 15 – 17, 19 – 21

Notes Sophs had trouble with degrees, minutes and seconds. Talk about marking angles as well as segments congruent. I encouraged them to write as much in pictures or symbols as possible.

Problem #5