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GEOMETRY II
Simple ideas to learn and laugh yearlong
By Elsy Neira
Trafford Publishing
Copyright © 2010 Elsy Neira
All right reserved.
ISBN: 978-1-4269-4536-6
Chapter One
Definition 1. Shape:
Shape is the space that an object occupies.
Geometric shapes can be open or closed.
Open shapes are: points, lines, and curves.
2. Closed shapes are figures made closed: triangles, circles, squares, rectangles, all these are made with segment lines.
3. Polygons
Polygons are figures classified by the number of sides they have. They can be regular if the sides are all the same length
They can be irregular if the sides are all different lengths.
A. Triangle
With three straight lines, we can make a polygon called a Triangle.
1. Equilateral:
A triangle has three straight sides.
It also has three ankles equal to 180°. A triangle can be Equilateral if all the sides are equal in length
2. Isosceles: Has two sides equal in length.
3. Scalene: Has all sides different in length.
According to the angles the triangle can be:
4. Acute triangle if it has an acute angle that measures less than 90°
5. Obtuse triangle if one of the angles is obtuse, or measuring more than 90°
6. Right triangle if one of the angles is right measuring 90°
B. Quadrilateral: Is a polygon with four straight sides.
1. Square: Is a polygon with all sides straight and the same length.
2. Rectangle: Is a polygon with two short sides and two long sides and four right angles.
3. Parallelogram: Is a rectangle that has two pairs of parallel sides, but not all the angles are right.
4. Rhombus: Is a polygon with four straight sides of equal length.
5. Trapezoid: Is a polygon with four straight sides and only two parallel sides
C. Pentagon: Is a polygon with five straight sides.
D. Hexagon: Is a polygon with six straight side
E. Heptagon: Is a polygon with seven straight sides
F. Octagon: Is a polygon with eight straight sides
Silly Stories
3 Trini Triangle
She has three straight sides Trini Triangle can jump three times.
4 Forrest Square
He has four straight sides. Forrest square can cry four times.
5 Fabian Pentagon
He has five straight sides. Fabian Pentagon can count to five.
6 Sixto Hexagon
He has six straight sides. Sixto Hexagon can eat six pies.
7 Severin Septagon
He has seven straight sides. Severin septagon can run seven miles
8 Edwin Octagon
He has eight straight sides. Edwin Octagon gets tired at eight o'clock.
Glossary of Terms
Geometric Shapes
Is the space that an object occupies.
Open Shape
Is a shape open, made with points, lines, curves.
Close Shape
Figures made closed with segment lines
Polygons
A many sided closed figure
Regular Polygon
Polygon with equal length sides.
Irregular Polygon
Polygon with irregular length sides
Triangle
A figure with three sides and three angles
Isosceles Triangle
A triangle with two sides equal in length and with two angles equal in measure.
Equilateral Triangle
A triangle with all sides equal is a triangle with all sides equal in length and all angles equal in measure.
Scalene Triangle
A triangle with all sides and angles with different measures.
Right Triangle
A triangle with one right angle
Obtuse Triangle
A triangle with one obtuse angle
Acute Triangle
A Triangle with an acute angle
Quadrilaterals
A four sided figure with four angles that equal to 360°
Rectangle
A quadrilateral with two sides equal in length and four right angles
Rhombus
A parallelogram with four sides of measure
Trapezoid
A four sided figure with only one pair of parallel sides
Pentagon
A figure with five sides, the angles add up to 540°
Hexagon
A figure with six sides and six angles
Heptagon
A figure with seven sides and seven angles
Octagon
A figure with eight sides and eight angles
Diagonal of a Polygon
A line segment that connects one vertex to another vertex
Exterior Angle
Angle form extending one side of a polygon
(Continues...)
Excerpted from GEOMETRY II by Elsy Neira Copyright © 2010 by Elsy Neira. Excerpted by permission of Trafford Publishing. All rights reserved. No part of this excerpt may be reproduced or reprinted without permission in writing from the publisher.
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