An abridgment of Smith's Illustrated astronomy (1850)
Smith, Asa · New York, Cady & Burgess · leaf 9
arter of a circle, and contains 90 degrees. Jl Semi-circle is the half of a circle, and contains 180 degrees. Jin Jingle is formed by one line, meeting another at a point. Jl Right Angle is an angle which contains 90 degrees, or a quarter of a circle. Jin Acute Angle is an angle which contains less… … CONCENTRJC CIRCLES ABRIDGMENT OF SMITHS ILLUSTRATED ASTRONOMY, LESSON I. Question. What is the body called upon which we live ? Answer. It is called the Earth, or World. Q. What idea had the Ancients respecting the shape otthe earth ? A. They believed it was an extensive plain,rendered uneven by…
Astronomy, Juvenile and popular
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