Exploring Isosceles and Equilateral Triangle Properties

What does it mean when two sides of a triangle have matching tick marks?

• The sides are perpendicular.

• The sides are congruent.

• The sides are parallel.

• The sides are different lengths.

In an isosceles triangle, if two sides are equal, what can be said about the angles opposite these sides?

• They are supplementary.

• They are right angles.

• They are complementary.

• They are equal.

If the top angle of an isosceles triangle is 36 degrees, what are the measures of the base angles?

• 72 degrees each

• 36 degrees each

• 54 degrees each

• 90 degrees each

What is the perimeter of a triangle with sides 2x+4, 2x+4, and x+2 if the perimeter is 45 cm?

• 25 cm

• 15 cm

• 45 cm

• 35 cm

If x equals 7, what is the length of the side represented by 2x+4?

• 26 cm

• 22 cm

• 18 cm

• 14 cm

What is the defining property of an equilateral triangle?

• Only two sides are equal.

• All sides and angles are equal.

• All angles are different.

• All sides are different lengths.

What is the measure of each angle in an equilateral triangle?

• 45 degrees

• 90 degrees

• 120 degrees

• 60 degrees

If one side of an equilateral triangle is 26 cm, what are the lengths of the other sides?

• 39 cm each

• 26 cm each

• 52 cm each

• 13 cm each

What does it mean if a line bisects an angle in a triangle?

• The angle is halved.

• The angle is divided into two unequal parts.

• The angle is divided into two equal parts.

• The angle is doubled.

If the vertex angle of an isosceles triangle is 44 degrees, what are the measures of the base angles?

• 68 degrees each

• 44 degrees each

• 72 degrees each

• 90 degrees each