Isosceles and Equilateral Lessons

Isosceles & Equilateral Triangles

Geometry

Open Ended

Warm-Up: What is special about an isosceles triangle?

Draw

Draw an isosceles triangle and put in congruent markings.

Multiple Choice

Which pair of angles is congruent?

• <A and <B

• <A and <C

• <B and <C

Multiple Choice

Which angle is the vertex angle?

• <C

• <A

• <B

Multiple Choice

Which segment is the base?

• Segment AB

• Segment BC

• Segment AC

Multiple Choice

What is the value of x?

• 12

• 11

• 8

• 6

Multiple Choice

What is the value of z?

• 86

• 68

• 44

• 34

Multiple Choice

What is the value of x?

• 12

• 7

• 11

• 10

Multiple Choice

What is the value of x?

• 72

• 67

• 65

• 54

Multiple Choice

What is the value of x?

• 41

• 45

• 31

• 98

Multiple Choice

What is the characteristics of an equilateral triangle?

• Two sides are equal

• All three sides and all three angles are equal

• No sides are equal

Draw

Draw an equilateral triangle and put in congruent markings.

Multiple Choice

What is the value of x?

• 9

• 11

• 8

• 6

Multiple Choice

What is the value of x?

• 51

• 43

• 60

• 75

Poll

Are you understanding the math concepts from this lesson today?

Open Ended

As you met the success criteria for isosceles and equilateral triangles, write down one important thing to remember about the lesson today.