Answer:
Step-by-step explanation:

<span>which means the word ur</span>
As given,
The diameter of one glass bead = 0.4 cm
As the beads are stringed/attached end to end that means a straight line of beads (diameter) can be imagined and adding up all the diameters or multiplying the diameter with total number of beads, we can get the total length of the necklace.
Hence, the length can be found as =
cm
or converting this in meters we get
meter
Hence, the necklace will me 40 meters long.
B. 42 degrees
Angle ABC is an inscribed angle so u have to divide Arc AC by 2 to find angle ABC.
84degrees divided by 2 is 42 degrees.
If an angle is 90 degrees its right, if it's more that 90 degrees its obtuse, if it's less it acute