The water content of a soil volume is measured four times gravimetrically by oven drying. The mean value of the water content is
23.2%. If the standard deviation of the four measurements is 1.0%, the 99% confidence interval for the soil water content is most nearly:________. A. (19.5%, 26.9%)
B. (18.6%, 27.8%)
C. (20.6%, 25.8%)
D. (20.9%, 25.5%)
Angle ADB= 40 degrees. The triangle ADB is equal to 180 degrees. Subtract 180-105=75 Since vertical angles are always congruent angle ABD= 35 degrees. So 75-35=40. I hope this is what you’re looking for
The Side-angle-side postulate states that if the pair of a corresponding sides and angles formed between these sides of two triangles are equal in measurement then these two triangle are said to be congruent.
As shown in figure 1 below:
In Δ HIJ and ΔKLM,
∠I = ∠L = 20° and HI = KL = 5 units
Since the ∠I lies between HI and IJ and ∠L lies between KL and LM, ∴ if IJ = LM then Δ HIJ and ΔKLM will be congruent by SAS postulate.