Triangles and Angles - Frederick Douglass Academy High

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Transcript Triangles and Angles - Frederick Douglass Academy High

Geometry OTQ

Are you ready for this chapter?

pg. 235 1 – 3, 5, and 6 g 2

Homework Questions?

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What will I be able to do?

Identify and classify triangles by angles and sides

What standard will I learn?

12.0 Students find/use measures of sides/angles of triangles

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4.1 Triangles and Angles

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Classifying Δs (angles vs sides) Equiangular (all   s) Equilateral (3  sides) Acute (3 acute  s) 40 80 60 Isosceles (2  sides) Right (1 right  ) Scalene (0  sides) Obtuse (1 obtuse  ) 120 g 2

What kind of triangle does the cable suspension of this bridge have?

RIGHT TRIANGLE!!!!

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Example 1: Classify each triangle by its angles and sides.

1. MNQ acute; equilateral

2.

NQP

obtuse; scalene 3. MNP acute; scalene g 2

Example 2:

Classify the triangle by the description given:

A) Side lengths: 3 in, 5 in, 3 in

Isosceles

B) Side lengths: 3 ft, 5 ft, 4 ft

Scalene

C) Angle measures: 60 °, 90°, 30°

right

D) Angles measures: 10 °, 160°, 10°

obtuse g 2

Pencils Down!

Complete the sentence with always, sometimes, or never.

2) A right ________ has an angle of 90 °.

sometimes

3) An isosceles triangle is __________ an equilateral .

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SUMMARY

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CLASSWORK Pages 241 – 242 #’s 22 – 36 even, 40 – 46 even

Homework is on the next slide

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HOMEWORK Page 244 #’s 74 – 80 even

Do your homework….or Pyramid Head will be sent to your house!!!

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