Equilateral and Isosceles Triangles

What is always true about an isosceles triangle? (SELECT ALL THAT APPLY)

• At least two sides are congruent

• At least two angles are congruent

• All of its angles are congruent

• All of its sides are congruent

• One of the angles is 90 degrees

What is always true about an equilateral triangle? (SELECT ALL THAT APPLY)

• At least two sides are congruent

• At least two angles are congruent

• All of its angles are congruent

• All of its sides are congruent

• One of the angles is 90 degrees

What do the angles in an equilateral triangle measure?

• 30, 60, 90

• 60, 60, 60

• 45, 45, 45

• 90, 90, 90

Which angle is the vertex angle?

• <C

• <A

• <B

Which segment is the base?

• Segment AB

• Segment BC

• Segment AC

If two sides of a triangle are congruent, then the _________________ opposite those sides are congruent.

• sides

• vertices

• angles

• measures

The sides of an equilateral triangle have...

• different measures.

• 90°.

• equal measures.

• 60°.

Which of the following statements are true?

• A scalene triangle has at least one obtuse angle

• External angles of a triangle have a sum of 180º

• An equilateral triangle is also isosceles

• A right triangle has two right angles.

Find x.

• 180

• 57

• 61.5

• 32.7

Find s

• 60

• 30

• 90

• 45