25. A manufacturer needs to place ten identical ball bearings against the inner side of a circular containe such that each ball bear
ing touches two other ball bearings, as in the picture on the
right. The (inner) radius of the container is 4 cm
(a) Find the common radius of the ball bearinga
(b) The manufacture Deeds to place a circular ring
inside the container. What is the largest possible
(outer) radius of the ring such that it is not on top
of the ball bearings and its base is level with the
base of the container?

false

step-by-step explanation:

the reason i say this is because for a certain length of sides you can pick any two and the length is wither equal or greater than the third side and in this case it's not.

3 + 5 = 8

8 is smaller than 9 which is the third side.

hope this : )

b.

step-by-step explanation:

i just know

m∠abd = m∠dbc

step-by-step explanation:

given : ab bisects ∠dbc

as we know that bisection means ab divides   ∠dbc   in two equal angles named as   ∠dba and   ∠abc

so, m∠abd = m∠dbc  

because ab bisects ∠dbc.

hence , the first statement m∠abd = m∠dbc is true.