Point z is the circumcenter of δlmn.

which must be true?

bmz cmz
zbm zcm

we know that

The circumcenter is the center of the the circle that passes through all three of the triangle's vertices.  Is the point of intersection of perpendicular bisectors of three sides of the triangle

so

-----> is equal to the radius of the circle  that passes through all three of the triangle's vertices

In this problem

m∠ZBM=

m∠ZCM=

therefore

m∠ZBM=m∠ZCM -----> is true-

the answer is the option

m∠ZBM=m∠ZCM

the total estimated nappy use.=10,500,000

step-by-step explanation:

given that on an average the average baby uses 3528 napkins.

in a particular year 2014, the number of births were 299697 in new south wales.

rounding off the number of births to the nearest hundred thousand we have

no of birtsh = 300000

also rounding off the average usage to nearst thousand we get

average use of a baby = 3500

hence total number of nappy estimated to be used = 3500x300000

= 10,500,000

answer is 10,500,000 nappies