4-2 Isosceles and Equilateral Triangles

What are the properties of an isosceles triangle?

• An isosceles triangle has two sides of equal length and two equal internal angles.

• An isosceles triangle has only one equal internal angle

• An isosceles triangle has no equal sides

• An isosceles triangle has three sides of equal length

Tags

CCSS.2.G.A.1

What are the properties of an equilateral triangle?

• All sides are equal in length but angles are different

• Two sides are equal in length and two angles are equal

• All sides are different lengths and all angles are different

• All three sides are equal in length and all three angles are equal.

Tags

CCSS.4.G.A.2

How do you calculate the angles in an isosceles triangle?

• Use the formula: angle = (180 - base angle) / 2

• Use the formula: angle = (base angle) / 2

• Use the formula: angle = (180 * base angle) / 2

• Use the formula: angle = (180 + base angle) / 2

Tags

CCSS.8.G.A.5

If the perimeter of an equilateral triangle is 30 cm, what is the length of each side?

• 25 cm

• 15 cm

• 10 cm

• 20 cm

Tags

CCSS.3.MD.D.8

If one angle of an isosceles triangle is 100°, what are the measures of the other two angles?

• The measures of the other two angles are 60° each.

• The measures of the other two angles are 90° each.

• The measures of the other two angles are 40° each.

• The measures of the other two angles are 120° each.

Tags

CCSS.8.G.A.5

Find the value of x

• 41
• 45
• 31
• 98

Tags

CCSS.8.G.A.5

What is the measure of ∠A?

• 46

• 134

• 90

• 88

Tags

CCSS.8.G.A.5

UW≅ ??

• UT

• YX

• UY

• TW

Tags

CCSS.HSG.CO.B.7

What is the value of x?

• 90

• 21

• 45

• 35

Tags

CCSS.8.G.A.5

What is the value of x?

Mathematical Equivalence

ON

Tags

CCSS.8.G.A.5