True Or False Questions 1. All Isoceles Triangles have at least two acute angles

2. If the perimeter of an equilateral triangle is P, then the length of each of the sides is P/3.

3. All isosceles triangles are equilateral triangles.

4. If you know the length of one of the legs of an isosceles triangle, you can determine it’s perimeter

5. The exterior angle of an equilateral triangle is obtuse

The true and false statements need to be identified.

1. true

2. true

3. false

4. false

5. true

In an isosceles triangle two angles are equal.

Let the equal angle be and the other angle be

The sum of angles is

Now the value of cannot be or greater because

has to be less than .

The two equal angles must always be acute.

So, the statement is true.

If the side of an equilateral triangle is

Perimeter will be

The statement is true.

An isosceles triangle that has the legs equal and also the base equal is called an equilateral triangle.

In an isosceles triangle the base may not be equal to the other two sides.

The statement is false.

Let be the length of the equal sides and the length of the other side

Permiter is

Since, the other side is not know the perimeter cannot be found.

The statement is false.

In an equilateral triangle all angles are

Exterior angle is found by subtracting the interior angle from

So, for an equilateral triangle the exterior angles will always be

The angles is greater than always.

The statement is true.

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Step-by-step explanation:

TRUE

All isosceles triangles have at least 2 acute angles due to 2 sides are equal.

The exterior angle of an equilateral triangle is obtuse.

If the perimeter of an equilateral triangle is P, then the length of each of the sides is P/3.

FALSE

All isosceles triangles are equilateral triangles.

If you know the length of one of the legs of an isosceles triangle, you can determine it’s the perimeter