Isosceles and Equilateral Triangles Solve X

A triangle has side lengths of 19 centimetres, 19 centimetres, and 20 centimetres. What type of triangle is this?

• equilateral triangle

• isosceles triangle

• scalene triangle

• none of the above

When classifying a triangle by its sides, what type of triangle has exactly two equal sides?

• equilateral triangle

• isosceles triangle

• scalene triangle

• none of the above

What is the value of x?

• 60

• 5

• 10

• -3

Identify the type of triangle.

• Equilateral

• Isoceles

• Scalene

Put the steps in order to solve for x.

1. It's a ​ (a)   triangle.

2. 2. That means the opposite sides of the congruent triangle are ​ (b)   .

3. 3. Set up the equation: ​ (c)   and use Desmos or solve by hand.

4. 4. x = ​ (d)  

• isosceles

• equilateral

• equal

• 5=2x-3

• 5+2x-3=180

• 4

• 1

• -4

• -1

• scalene

• 40

• 70

• 180

• 90

In this isosceles triangle, what is the length of x?

• 8√2

• 16

• 8

What type of triangle is this? 

• equilateral

• obtuse

• scalene

• isosceles

What is the value of the missing angle?

• 61

• 50

• 60

• 69

• 72
• 67
• 65
• 54