Equilateral & Isosceles Triangles Period 9

Front

What is an equilateral triangle?

Back

An equilateral triangle is a triangle in which all three sides are of equal length and all three angles are equal, each measuring 60°.

Front

What is an isosceles triangle?

Back

An isosceles triangle is a triangle that has at least two sides of equal length and the angles opposite those sides are equal.

Front

How do you find the missing angle in a triangle?

Back

To find the missing angle in a triangle, use the fact that the sum of all angles in a triangle is 180°. Subtract the sum of the known angles from 180°.

Front

If two angles of an isosceles triangle are 40°, what is the measure of the vertex angle?

Back

The vertex angle is 100°.

Front

What is the relationship between the angles in an equilateral triangle?

Back

All angles in an equilateral triangle are equal, each measuring 60°.

Front

How do you determine the length of a side in an isosceles triangle given the angles?

Back

Use the properties of isosceles triangles and trigonometric ratios if necessary, or apply the Law of Cosines.

Front

What is the formula for the area of a triangle?

Back

The area of a triangle can be calculated using the formula: Area = 1/2 * base * height.

Front

What is the significance of the base angles in an isosceles triangle?

Back

The base angles in an isosceles triangle are equal, which helps in solving for unknown angles and sides.

Front

If one angle of a triangle is 75° and the other two angles are equal, what are their measures?

Back

The other two angles measure 52.5° each.

Front

What is the sum of the interior angles of a triangle?

Back

The sum of the interior angles of a triangle is always 180°.