New Plane GeometryGinn, 1899 - 252 pagina's |
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A₁ A₁B₁ ABCD altitude angles are equal angles equal b₁ b₂ base bisected C₁ called central angles chord circumcenter circumference circumscribed congruent construct COROLLARIES corresponding Definitions diagonals diameter divided drawn equal angles equal circles equal segments equals the sum equiangular Exercises exterior angles figure of prop geometry given line given point greater Hence hypotenuse included angle inscribed inscribed angle interior intersecting isosceles triangle Law of Converse line joining line-segment locus of points mean proportional meet mid-points n-gon OB₁ opposite sides orthocenter parallel parallelogram pencil perigon perimeter plane produced Proof prop PROPOSITION prove quadrilateral radii radius ratio rectangle reflex angle regular polygon rhombus right angle right-angled triangle sides equal Similarly square straight angle straight line subtend Suppose tangent Theorem transversal trapezoid unequal vertex XVII
Populaire passages
Pagina 104 - Definition. The projection of a point on a line is the foot of the perpendicular from the point to the line. Thus A
Pagina 161 - The first and last terms of a proportion are called the extremes, and the two middle terms are called the means.
Pagina 147 - To draw a tangent to a given circle from a given point.
Pagina 121 - XLI. 2. The perpendicular bisector of a chord passes through the center of the circle and bisects the subtended ares.
Pagina 38 - If two triangles have two sides of the one respectively equal to two sides of the other, and the...
Pagina 131 - An angle in a segment is greater than, equal to, or less than, a right angle, according as the segment is less than, equal to, or greater than, a semicircle.
Pagina 65 - The lines joining the mid-points of the opposite sides of a quadrilateral bisect each other.
Pagina 46 - P' two parallels, and T, a transversal. To prove that any Z c equals its alternate Z a'. Proof. 1. Suppose Z c > Z. a!, and that Q is drawn as in the figure, making an Z equal to Z a'.
Pagina 132 - COROLLARY. Tangents to a circle from the same external point are equal. For, connect the points of tangency, and two angles of the triangle are equal by this theorem. 198. The theorem is often stated thus: An angle formed by a tangent and a chord of a circle is measured by half its intercepted arc.
Pagina 202 - That is, the number which represents its square units of area is the product of the two numbers which represent its base and altitude. For in prop. II, if R' = 1, the square unit of area, then a' and 6' must each equal 1, the unit of length.