Thesaurarium mathematicae, or, The treasury of mathematicks containing variety of usefull practices in arithmetick, geometry, trigonometry, astronomy, geography, navigation and surveying ... to which is annexed a table of 10000 logarithms, log-sines, and log-tangents / by John Taylor.

PROP. II. Two sides, and an Angle opposite to one of them in an Oblique-angled Triangle given, to find the other parts thereof.

In the Triangle ABC, the side AB is 30 parts, and the side AC, is 49 78/100 parts, and the opposite Angle C, is 37° 00'.

First, To find the Angle at B, this is the A∣nalogy* 1.1 or Proportion.

As Log. cr. AB 30 parts,

To S. V. at C 37° 00'.

So Log. cr. AC 49 78/100 parts,

To Sc. V. B 93° 00', as was required to be found.

Now seeing that the Angle C, is 37° 00', and the Angle B, is 93° 00', which makes 120° 00', therefore must the Angle A be 50° 00'; the

Complement to 180°: so having found all the three Angles, you may find the other side CB,* 1.2 38 19/100 parts, as afore in the first proposition, by his opposite Angle.

Notes

• * 1.1

  Fig. 36.
• * 1.2

  Fig. 36.