The difference in elevation between readings at A can be given as 2.484 ? 1.672 = 0.812 m and at B as 3.124 ? 1.928 = 1.196 m.
The true difference in elevation can be given as 1.196 ? 0.812 = 0.384 m.

Trapezoidal formula is based on assumption that mid-area is mean of end area. Based on this, trapezoidal formula will be worked out and furr calculations are done.

The value of eccentricity for small area can be given as,
e = (w1 + b/2 + n*h) / 3. On substitution, we get
e = 69.1.

The formula for prisomidal correction is given as, C_p = d n (h-h1)²/6 which is used based on type of work being done and accuracy of output required.

Permanent adjustments are done at time of manufacturing instruments whereas temporary adjustments are done at every instrumental setup.

The area of field can be given as A=M (F- I ± 10N + C). On substitution of given values we get,
234.315 = 22.15 (3.256-I+10+26.43)
I = 29.107 sq. m.

Every volumetric formula needs certain corrections in order to set errors occurred. In case of trapezoidal formula, prismoidal corrections will be applied so as to reduce error impact.

The formula of meridian and distance method can be given as,
A = ? (m*L). On substitution, we get
A = 233.4*110 + 12.78*-15 + 99.98*89
A = 34372.51 sq. m.

The formula for correction of prismoid in case of side hill section can be given as
C_p = d (w-w1)*(b/2 ? b/2 + m*h ? m?*h?)/12*n. On substitution, we get
C_p = 1 (117.86-98.76) * (4*105.76 ? 4*86.54) / 12*3
C_p = 30.6.

The value of M2 can calculated by M2 = M1 + D1 + D2. But we already know that M1 = D1. So, on substitution, we get
M2 = 24.86 + 24.86 + 17.65 = 67.37 m.