TODAY IN GEOMETRY…  STATs on Ch. 3 Test  Learning Target: 4.1 Classify Triangles and find measures of their angles  Independent Practice.

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Presentation transcript:

TODAY IN GEOMETRY…  STATs on Ch. 3 Test  Learning Target: 4.1 Classify Triangles and find measures of their angles  Independent Practice

HOW DID YOU “SHAPE” UP?? Results for ALL of my Geometry classes: GRADE NUMBER OF STUDENTS WHO TOOK THE CH.9 TEST (36 pts.) 1 ST PERIOD3 RD PERIOD5 TH PERIOD6 TH PERIODTOTAL A B C D11103 F22116 Avg

CLASSIFYING TRIANGLES BY SIDES AND ANGLES

CLASSIFYING TRIANGLES BY SIDES: TRIANGLE # of congruent sides example SCALENE ISOSCELES EQUILATERAL 0 2 3

REVIEW ANGLE VOCABULARY:

CLASSIFYING TRIANGLES BY ANGLES: TRIANGLE Type of Angle example ACUTE RIGHT OBTUSE EQUIANGULAR 3 acute angles 1 right angle 1 obtuse angle 3 congruent angles

B A C 1. Use the distance formula to find the length of each side. 2. Calculate slope to determine right angles.

B(-1, 2) A(0, 0) C(6, 3) None of the sides of the triangle have the same length so this triangle is SCALENE.

B(-1, 2) A(0, 0) C(6, 3)

INTERIOR VS EXTERIOR ANGLES

Extend sides of a polygon to find exterior angles. Interior angles are found inside the polygon.

TRIANGLE SUM THEOREM: ADDING ALL THE INSIDE ANGLES

1 3 2

Find x.

EXTERIOR ANGLE THEOREM: MEASURE OF THE OUTSIDE IS TWO OF THE INSIDE

EXTERIOR ANGLE THEOREM: The measure of an exterior angle of a triangle is equal to the sum of the measures of the two remote interior angles

Find x and y.

Find x.

Find x and y.

HOMEWORK #1: Pg. 221: 1-26, 32, 35-37