...every straight line in the plane and passing through the join of straight line and plane. [Th. I.] DEF. If a straight line is perpendicular to each of two intersecting straight lines it is said to be perpendicular to their plane. COR. A perpendicular to a plane is perpendicular to...

...subject, namely a model to illustrate the theorem: If a line is perpendicular to each of two other lines at their point of intersection it is perpendicular to the plane of the two lines. This model is made according to specifications, insuring uniformity, and I make a...

...subject, namely a model to illustrate the theorem: If a line is perpendicular to each of two other lines at their point of intersection it is perpendicular to the plane of the two lines. This model is made according to specifications, insuring uniformity, and I make a...

...straight lines. Two intersecting planes cut one another in a straight line and in no point outside it. If a straight line is perpendicular to each of two...straight lines at their point of intersection, it is also perpendicular to the plane in which they lie. All straight lines drawn perpendicular to a given...

...standing on the same arc. (b) Find the mean proportional between two given straight lines. (c) Prove that if a straight line is perpendicular to each of two...straight lines at their point of intersection, it is also perpendicular to the plane in which they lie. 8. (a) If the angles, G, H of a triangle FGH are...

...geometry, as will frequently be seen. THEOREM. If a straight line is perpendicular to each of two other straight lines at their point of intersection, it is perpendicular to the plane of the two lines. If students have trouble in visualizing the figure in three dimensions, some knitting...

...perpendicular to a straight line if the line is perpendicular to the plane. ,_ SOLID GEOMETRY PROPOSITION IV. THEOREM If a straight line is perpendicular to each...of intersection, it is perpendicular to the plane of those lines. Given str. line FB±AB and to BC at B, and plane MN containing AB and BC. To prove...

...of intersection with the plane is called the foot of the perpendicular. PROPOSITION IV. THEOREM 622. If a straight line is perpendicular to each of two...of intersection, it is perpendicular to the plane of those lines. M N\ ' / x. \ / E Given str. line FBA.AB and to BC at B, and plane MN containing AB...

...of intersection with the plane is called the foot of the perpendicular. PROPOSITION IV. THEOREM 622. If a straight line is perpendicular to each, of two...of intersection, it is perpendicular to the plane of those lines. Given str. line FBA.AB and to BC at B, and plane MN containing AB and BC. To prove...

...perpendicular to the plane. PROPOSITION II. THEOREM 431. If a line is perpendicular to each of two other lines at their point of intersection, it is perpendicular to the plane of the two lines. Given the line AO perpendicular to the lines OP and OR at 0. To prove that AO is...