## Concrete Geometry for Beginners |

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### Common terms and phrases

12 inches 20 inches 9 inches ABCD adjacent altitude angles formed base base angle called centimeters chord circle whose radius circumference coincide common Construct contains cube cubic diagonal diameter difference distance divided Draw drawn edge equal sides equilateral triangle exterior angles extremities faces feet figure Find the area Find the length Find the perimeter Find the ratio four Give given greater half hexagon Illustrate inches long inches longer inscribed interior isosceles triangle Join kind larger less measure meters middle point millimeters NOTE number of degrees opposite parallel perpendicular Place polygon PRINCIPLE prolonging proportion Quote radii rectangle regular hexagon represent rhomboid rhombus right angle right triangle rods sector shorter similar smaller solid square inches straight line SUGGESTION supplement surface tangent trapezium trapezoid triangle ABC twice vertex wide width

### Popular passages

Page 20 - A circle is a plane figure bounded by a curved line, every point of which is equally distant from a point within called the center.

Page 171 - The square of the sum of two numbers is equal to the square of the first, plus twice the product of the first and the second, plus the square of the second.

Page 175 - Pythagoras' theorem states that the square of the length of the hypotenuse of a right-angled triangle is equal to the sum of the squares of the lengths of the other two sides.

Page 101 - Hence, the area of a trapezoid is equal to the product of its altitude by the line connecting the middle points of the sides which are not parallel.

Page 130 - A Polygon of three sides is called a Triangle; of four sides, a Quadrilateral; of five sides, a Pentagon ; of six sides, a Hexagon, etc.

Page 74 - The measure of an exterior angle of a triangle is equal to the sum of the measures of the two remote interior angles.

Page 3 - The aim of the work is to awaken gradually, by simple and natural methods, the mathematical consciousness of the child, and to guide his perceptions in such a way as to lead him to lay a firm foundation for demonstrative geometry by means of his own observations and inventions.

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