80
8 x 10
2 x 4 x 5 x 2
2 x 2 x 2 x 2 x 5 <===
The distance between the center and any point on the circle is the radius. That's likely what your book or teacher is asking for.
Note: double the radius and you get the diameter
Answer:
50
Step-by-step explanation:
Use this equation

where b is arc VY, A is arc XV.
Substitute the equation in




so our arc measure is 50
Probability that gear 1 will fail = 5/100 (upto 10 years)
and 8/100 (after 10 years)
Probability that both will fail = 5/100 * 8/100
= 40/10000
= 0.4 %