Isosceles Triangle Theorems

Find the value of x. (Hint: what kind of triangle is this?)

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CCSS.8.G.A.5

Find the value of x. (Hint: What type of triangle is this?)

• 4

• 1

• -4

• 10

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CCSS.8.G.A.5

Find the value of y.

• 60

• 30

• 20

• 12

Tags

CCSS.8.G.A.5

Find the value of x. (Hint: what kind of triangle is this?)

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CCSS.HSG.CO.C.10

Find the value of y.

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CCSS.HSG.CO.C.11

Find the value of y.

• 5

• 10

• 15

• 20

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CCSS.HSG.CO.C.11

Find the value of z.

• 5

• 10

• 15

• 20

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CCSS.HSG.CO.C.9

Triangle DEF is isosceles, angle D is the vertex angle, DE = x + 7, DF = 3x – 1, and EF = 2x + 5.

Find the value of x.

(Hint: draw a picture)

• 2

• 4

• 6

• 8

Tags

CCSS.8.G.A.5

Triangle LMN is isosceles, angle L is the vertex angle, LM = 3x – 2, LN = 2x + 1, and MN = 5x – 2.

Find the value of x.

(Hint: draw a picture)

• 0

• 1

• 2

• 3

Tags

CCSS.8.G.A.5

Which of the following is a correct statement and reason for the proof shown?

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CCSS.HSG.SRT.B.5