——

aud Tables of, Logarithnns. 191As tbe Rectangle conteined under the Sines c the Sides, i lo the Square

H the Radius: 8 a NFo the Rectangle conteined ander the S ines of the Half Sam F the three

Sides, and the Difference between this Half gum and the Baſe,

To che Square f the Coſine of half the Angle required.*The Baſe ſubtended is 40. o0 n.The two Sides including the Angle f 250 ö 85The Sum of the three Sides 148 30The Half- Sum of theſe three 5 74 15The Difference between this and the Baſe 34 15

Here for the Square of Radius we take 20. OOOOοοο, to this we add9 9833805 che Sine of 34 gr. 15 min. and 9.750 3579 che Sine of 34 gr.15 min. which make 39.337384. aThen for the Rectangle of the Sides, we add 9.7941495 the Sine of38 fr. 30 cin. and 9. 97298 58, the Sine of 70 gr. Which make19.767 1373. This we take out of 39 7337384, and there remains forthe n of the Square 19.966603 1, the half thereof 9.98330 15we find to be the Coſine of 1 5 gr. 47 min. 13ſec. And ſo the wholeAngle required is 31 gr. 34 min. 26 fes. 5 5Or for ſuch Numbers as are to be ſubtracted, we may take them outof the Radius, and write down their Complements, and then add themtogether with the reſt, the manner of the work in eicher way will be ſuch.as followeth. f

40 gr. oo m.

38 3 9.7944 3089128 0 e ö f 270142ener i 9. 98338059

2 2.756357

8 20. OOo. 5 539.7337384..19.966603 Cr. m. ec. 19. 9666

9.983301 15, 47 13 9,9833615i 31 34 26 5

In