Lesson 1: Base Angle Theorem

The Base Angles Theorem states:

• If two angles of a triangle are congruent, then the sides opposite of those angles are congruent.
• If two sides of a triangle are congruent, then the angles opposite of those sides are congruent.
• If two triangles are congruent, then their corresponding sides and angles are congruent.
• None of the above.

Tags

CCSS.8.G.A.2

What additional information can we conclude?

• ∠ADB and ∠ADC are right angles
• ∠B≅∠C
• ∠BAD≅∠CAD
• None of the above

Tags

CCSS.HSG.CO.C.9

Find x.

• x = 5
• x = 4
• x = -4
• x = 20

Tags

CCSS.HSG.CO.C.11

• 25°
• 50°
• 65°
• 80°

Tags

CCSS.8.G.A.5

Find x.

• 180
• 57
• 61.5
• 32.7

Tags

CCSS.8.G.A.5

• 72
• 67
• 65
• 54

Tags

CCSS.8.G.A.5