Bell Ringer 5.5
KJ and KM are opposite rays, and KN bisects < JKL. Draw a picture and answer the following questions.
If m< JKL = 9y + 5 and m< JKN = 5y + 2, find m< JKL.
Homework: Due Thursday: 1­4: Pg. 41 ­ 44 (12 ­ 72, every 4th, not 48)
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Today's objectives:
­ Measure and classify angles.
­ Identify and use congruent angles and the bisector of an angle.
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Vocabulary Terms:
Ray ­ has one endpoint and extends indefinitely in one direction. Opposite Rays ­ are collinear, share one endpoint and go in opposite directions.
Right Angle ­ 90 degrees
Acute Angle ­ measure less than 90 degrees
Obtuse Angle ­ measures more than 90 degrees.
Angle Bisector ­ a ray that divides an angle into two congruent angles.
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Angles and their parts:
a. Name all angles that have B as a vertex.
b. Name the sides of < 3.
c. What is another name fo < GHL?
d. Name a point in the interior of < DBK.
e. Name a point in the exterior of < CLH.
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Use the following model to classify and estimate the angles:
a. < MJP
b. < LJP
c. < NJP
a. < AFB
b. < CFA
c. < AFD
d. < CFD
<
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Measure and Classify Angles:
KJ and KM are opposite rays, and KN bisects < JKL. Draw a picture and answer the following questions.
a. If m< JKN = 8x ­ 13 and m< NKL = 6x + 11, find m< JKN.
b. If m< JKL = 9y + 5 and m< JKN = 5y + 2, find m< JKL.
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