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ABCD algebraic altitude base becomes called centre centre-line chord circle coincide common concurrent congruent considered constant construct Converse corresponding denote describe determine diagonals diameter difference direction distance divide draw drawn equal expressed external figure fixed four geometric given line given point gives greater harmonic Hence internal intersect inverse join length lies line-segment mean measure median meet middle point one-half opposite opposite sides pair parallel passes perpendicular placed plane point of contact polar polygon position Proof proved quadrangle radical axis radius range ratio rectangle regular relation respectively right angle right bisector rotation secant segment sense sides similar Similarly square straight symbol taken tangent theorem touch triangle vertex vertices
Page 176 - The square described on the hypothenuse of a rightangled triangle is equal to the sum of the squares described on the other two sides.
Page 260 - Three lines are in harmonical proportion, when the first is to the third, as the difference between the first and second, is to the difference between the second and third ; and the second is called a harmonic mean between the first and third. The expression 'harmonical proportion...
Page 19 - Every circumference of a. circle, whether the circle be large or small, is supposed to be divided into 360 equal parts called degrees. Each degree is divided into 60 equal parts called minutes, and each minute into 60 equal parts called seconds.
Page 77 - J_ to the given line. .'. the construction gives the perpendicular to a given line at a given point in the line.
Page 122 - And conversely, if the square on one side of a triangle is equal to the Bum of the squares on the other two sides, the angle contained by these two sides is a right angle.