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Identify and classify triangles by angles and sides

What standard will I learn?

12.0 Students find/use measures of sides/angles

of triangles

(all s)

Acute

(3 acute s)

Right

(1 right )

Obtuse

(1 obtuse )

Equilateral

(3 sides)

Isosceles

(2 sides)

Scalene

(0 sides)

Classifying Δs (angles vs sides)40

80

60

120

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

RIGHT TRIANGLE!!!!

Example 1: bridge have?

Classify each triangle by its angles and sides.

1. MNQ

2.NQP

3. MNP

acute; equilateral

obtuse; scalene

acute; scalene

Example 2: bridge have?

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

Pencils Down! bridge have?

Complete the sentence with always, sometimes, or never.

- A scalene is ________ an equilateral .
- A right ________ has an angle of 90°.
- An isosceles triangle is __________ an
equilateral .

never

always

sometimes

SUMMARY bridge have?

HOMEWORK bridge have?

Page 244 #’s 74 – 80 even

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

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