 | William Betz, Harrison Emmett Webb - Geometry, Solid - 1916 - 214 pages
...equally distant from the center ; and, conversely, chords equally distant from the center are equal. 270. A straight line perpendicular to a radius at its extremity is a tangent to the circle. 275. The tangents drawn to a circle from an external point are equal, and make equal angles with the... | |
 | Charles Austin Hobbs - Geometry, Solid - 1921 - 216 pages
...the same circle, or in equal circles, chords equally distant from the centre are equal. Prop. 116. A line perpendicular to a radius at its extremity is a tangent to the circle. Prop. 117. A tangent to a circle is perpendicular to the radius drawn to the point of contact. Prop.... | |
 | William Betz, Harrison Emmett Webb, Percey Franklyn Smith - Geometry, Plane - 1912 - 356 pages
...II. When A is without the circle (Fig. 2). (To be completed.) TANGENTS PROPOSITION VIII. THEOREM 270. A. straight line perpendicular to a radius at its extremity is a tangent to the circle. AT Given the circle 0, the radius OC, and the line AB perpendicular to OC at its extremity C. To prove... | |
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A straight line perpendicular to a radius at its extremity is a tangent to the circle. Let MB be perpendicular to the radius OA at A. 
