Question

4. The diameter of circle C is 18 cm. Chord AD is the same length as a radius. Use this information, the diagram, and your experiences in geometry this semester to answer these questions. (Use pie = 3.14 .)
a.) What are the measures of angles BDA and DBA?
b.) What is the sine of angle DBA?
c.) Find the length of arc AB to the nearest hundredth.
d.) How does the length of arc AD compare to the length of arc AB?
e.) If EF = 1/2 BD, then what is the degree measure of arc EF?
Answer:

Answer 1

So \(\triangle ACD\) is equilateral triangle, right?

Answer 2

So can you tell me what \(m\angle BDA\) is?

Answer 3

I can not tell

Answer 4

You do agree that \(\triangle ACD\) is equilateral triangle, right?

So all angles in equilateral triangle are always ...?

Answer 5

yes it looks that way

Answer 6

they are alway equal

Answer 7

yeah. So since \(m\angle BDA\) is IN △ACD, what is angle?

Answer 8

BDA = 60 degress