## Plane Geometry: With Problems and Applications |

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### Common terms and phrases

ABCD acute angle altitude angle formed apothem axes of symmetry axioms bisects called central angle chord circle tangent circumscribed coincide congruent corresponding sides Definition diagonal diameter distance divided dodecagon Draw drawn equal angles equal circles equiangular equilateral triangle EXERCISES exterior angle figure Find the area Find the locus Find the radius fixed point geometric Give the proof given point given segment given triangle greater Hence hypotenuse hypothesis inches inscribed intersect isosceles trapezoid isosceles triangle l₁ length line-segment measure meet middle points number of sides Outline of Proof parallel lines parallelogram perigon perimeter plane proof in full quadrilateral radii ratio rectangle regular hexagon regular octagon regular polygon rhombus right angle right triangle secant semicircle Show shown square straight angle straight line subtend SUGGESTION THEOREM trapezoid triangle ABC vertex vertices width

### Popular passages

Page 215 - If two triangles have two sides of the one equal to two sides of the other...

Page 35 - An exterior angle of a triangle is equal to the sum of the two opposite interior angles.

Page 22 - Any side of a triangle is less than the sum of the other two sides...

Page 113 - Sines that the bisector of an angle of a triangle divides the opposite side into parts proportional to the adjacent sides.

Page 273 - This textbook may be borrowed for two weeks, with the privilege of renewing it once. A fine of five cents a day is incurred by failure to return a book on the date when it is due. The Education Library is open from 9 to 5 daily except Saturday when it closes at 12.30.

Page 52 - The straight line joining the middle points of two sides of a triangle is parallel to the third side and equal to half of it 46 INTERCEPTS BY PARALLEL LINES.

Page 174 - The areas of two regular polygons of the same number of sides are to each other as the squares of their radii, or as the squares of their apothems.

Page 153 - The formula states that the square of the hypotenuse of a right triangle is equal to the sum of the squares of the base and altitude.

Page 219 - Find the locus of a point such that the difference of the squares of its distances from two fixed points is a constant.

Page 202 - The area of a rectangle is equal to the product of its base and altitude.