.Advance Praise for Head First 2D Geometry
“Head First did it again. The ability to make the reader understand, despite tricky topics, really shines through in Head First 2D Geometry! The way the information is presented and organized makes learning cohesive and easy. Coming from someone who has struggled with many aspects of math in the past, this book helps you understand the basics and build on them.
Historians agree that Plato is the man sitting in the
middle of the scene, beneath one of the sacred olive
trees. He sits with bare feet and points to something
on the globe. The identities of Plato’s companions
are less certain. They may be individuals named by
the ancient Roman historian Vitruvius as the great
ancient astronomers, including Pythagoras of Samos
who is best known for developing the Pythagorean
Lines and angles Triangles Isosceles and equilateral triangles Rectangles, squares, and parallelograms Circles Advanced circle problems Polygons Cubes and other rectangular solids Cylinders Coordinate signs and the four quadrants Defining a line on the coordinate plane Graphing a line on the coordinate plane Midpoint and distance formulas Coordinate geometry Summing it up
In this chapter, you’ll review the fundamentals involving plane geometry, starting with the following: • • • • • • Relationships among angles formed by intersecting lines Characteristics of any triangle Cha...
– ACT MATH TEST PRACTICE –
74. Choice f is correct. Since YW is an altitude in an equilateral triangle, it bisects the opposite side. XW and WZ are both 7 inches. See the diagram below.
An altitude also makes a right angle and, therefore, the Pythagorean theorem can be used to ﬁnd the length of the altitude. Refer to triangle WXY. The hypotenuse is 14 inches and one leg is 7 inches. a2 + b2 = c2 72 + b2 = 142 49 + b2 = 196 b2 = 147 b = 147 b=7 3 The length...