The video tutorial explains how to find the length of chord CD in an equilateral triangle ABC inscribed in a circle. It covers the use of circle theorems, similarity, and scale factors to relate the sides of triangles. The tutorial also demonstrates the calculation of unknown lengths using trigonometry and the Pythagorean theorem, leading to the final solution for the length of chord CD.

What is the main geometric shape discussed in the problem?

• Rectangle

• Equilateral Triangle

• Square

• Pentagon

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

• 45 degrees

• 60 degrees

• 90 degrees

• 120 degrees

Which triangles are identified as similar in the problem?

• Triangle ABE and Triangle CDE

• Triangle AEB and Triangle CED

• Triangle ABC and Triangle DEF

• Triangle ACD and Triangle BEC

How is the length of AB calculated?

• By dividing AE by EC

• By adding AE and EC

• By multiplying AE and EC

• By subtracting AE from EC

What is the scale factor relationship established in the problem?

• AB/CE = BE/CD

• AB/CE = CD/BE

• AB/BE = CD/CE

• AB/CD = BE/CE

What is the midpoint of line AC labeled as?

• O

• N

• P

• M

Which trigonometric function is used to find BM?

• Cosine

• Tangent

• Sine

• Secant

Which theorem is used to find the length of BE?

• Pythagorean Theorem

• Thales' Theorem

• Ceva's Theorem

• Menelaus' Theorem

What is the final length of CD as calculated in the problem?

• 10/sqrt(19)

• 5/sqrt(19)

• 15/sqrt(19)

• 20/sqrt(19)