Plane and solid geometry . 5. 6. 7. Reasons 1. § 161, a. 2. § 613 3. § § 613. 5. § 617, II. 6. By hyp. 7. Args. 5 and 6. 8. § 178. 9. § 161, h. 619. Def. A straight line is perpendicular to a plane if it is perpendicular to every straiglit line in the plane passingthrough the point of intersection of the given line and plane. 620. Def. A plane is perpendicular to a straiglit line if the line is perpendicular to the plane. 621. Def. If a line is perpendicular to a plane, its point ofintersection with the plane is called the foot of the perpendicular. 306 SOLID GEOMETRY Proposition IV. The
Plane and solid geometry . 5. 6. 7. Reasons 1. § 161, a. 2. § 613 3. § § 613. 5. § 617, II. 6. By hyp. 7. Args. 5 and 6. 8. § 178. 9. § 161, h. 619. Def. A straight line is perpendicular to a plane if it is perpendicular to every straiglit line in the plane passingthrough the point of intersection of the given line and plane. 620. Def. A plane is perpendicular to a straiglit line if the line is perpendicular to the plane. 621. Def. If a line is perpendicular to a plane, its point ofintersection with the plane is called the foot of the perpendicular. 306 SOLID GEOMETRY Proposition IV. Theorem 622. If ci straight line is perpendicular to each oftwo intersecting straight liives at their point of inter-section, it is perpendicular to the plane of those
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectgeometr, bookyear1912
