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On the fourth page of Richard Turner's 1765 book "Plain Trigonometry," Turner concludes his basics of working with triangles. Here he explains what we call today the rule of similar triangles.
In the third page of Richard Turner's 1765 book "Plain Trigonometry," he expands on his review of the basic rules of triangles, which are still applicable and taught today. Here he defines right and oblique triangles.
In this, the second page of Richard Turner's 1765 book "Plain Trigonometry," he continues to review the basic rules of working with triangles, which are still applicable and taught today. On this page, he defines a right angle and shows how to find…
In this, the first content page of Richard Turner's 1765 book "Plain Trigonometry," he begins to review the basic rules of working with triangles, which are still applicable and taught today.