6.8A Triangles Lesson

6.8A Triangles Lesson

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To form a triangle the sum of the smallest two sides MUST be greater than the largest side

• a + b > c

• Do these lengths form a triangle?

• 3 , 4, 6

Open Ended

Do these side lengths form a triangle? Why or Why Not?

3, 4, 6

Multiple Choice

Do these side lengths form a triangle?

15, 12, 9

• Yes

• No

• I don't know.

Multiple Choice

What is a possible third side to a triangle with side lengths of 13 and 4?

• 9
• 12
• 8
• 5

The angles inside the triangle MUST add up to equal 180°

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You must find the missing angle

• What does that square represent?

• 90°

• How do I find the missing angle?

• Add the two known angles THEN subtract that sum from 180°

Open Ended

What is the measurement of the missing angle?

Multiple Choice

Max cut out a triangle to use in his collage. One angle measured 46° and another measured 67°. What was the measure of the third angle?

• A

• B

• C

• D

Multiple Choice

What is the measure of the missing angle?

• A

• B

• C

• D