The Universal Preceptor: Being a General Grammar of Arts, Sciences, and Useful Knowledge ...A. Phelps, 1826 - 312 страница |
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Страница 208
... Angles are the corners , formed by the meeting of two lines . A right angle is , when the lines are perpendicular to each other ; an acute angle is less than a right angle ; and an obtuse angle is greater than a right angle . EQUI ...
... Angles are the corners , formed by the meeting of two lines . A right angle is , when the lines are perpendicular to each other ; an acute angle is less than a right angle ; and an obtuse angle is greater than a right angle . EQUI ...
Страница 209
... angles which have equal angles , have all their sides in equal proportion . This is the foundation of tables for calculating triangles . 565. In every triangle , the three angles together contain 180 degrees ; and as a right angle is 90 ...
... angles which have equal angles , have all their sides in equal proportion . This is the foundation of tables for calculating triangles . 565. In every triangle , the three angles together contain 180 degrees ; and as a right angle is 90 ...
Страница 210
... angles . Hence , if the base of a triangle be 67 yards , and the angle 36 degrees , I can , in a moment , ascertain the length of the other sides , by making a rule of pro- portion from the tables . Obs . In these tables , it should be ...
... angles . Hence , if the base of a triangle be 67 yards , and the angle 36 degrees , I can , in a moment , ascertain the length of the other sides , by making a rule of pro- portion from the tables . Obs . In these tables , it should be ...
Страница 211
... angles are calculated , which have 1,000,000,000 for the radius , are called tables of sines and tangents , and are to be found in various books of mathematics . The numbers are reduced to logarithms for greater ease in making the ...
... angles are calculated , which have 1,000,000,000 for the radius , are called tables of sines and tangents , and are to be found in various books of mathematics . The numbers are reduced to logarithms for greater ease in making the ...
Страница 212
... angles , whose sides are parts of the circles of the earth and heavens : hence , it is highly useful to the astrono- mer and navigator . It enables us to calculate the heights of buildings and mountains , and the distance of celestial ...
... angles , whose sides are parts of the circles of the earth and heavens : hence , it is highly useful to the astrono- mer and navigator . It enables us to calculate the heights of buildings and mountains , and the distance of celestial ...
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