Mathematics in Context: Looking at an Angle

Encycbrita, "Mathematics in Context: Looking at an Angle"
Holt McDougal | 2006 | ISBN: 0030385695 | 72 pages | PDF | 4 MB

Dear Student,
Welcome to Looking at an Angle!
In this unit, you will learn about vision lines and blind areas. Have
you ever been on one of the top floors of a tall office or apartment
building? When you looked out the window, were you able to see the
sidewalk directly below the building? If you could see the sidewalk, it
was in your field of vision; if you could not see the sidewalk, it was in
a blind spot.
The relationship between vision lines and
rays of light and the relationship between
blind spots and shadows are some of the
topics that you will explore in this unit.
Have you ever noticed how the length
of a shadow varies according to the time
of day? As part of an activity, you will
measure the length of the shadow of a
stick and the corresponding angle of the
sun at different times of the day. You will
then determine how the angle of the sun
affects the length of a shadow.
Besides looking at the angle of the sun, you
will also study the angle that a ladder makes
with the floor when it is leaning against a wall
and the angle that a descending hang glider
makes with the ground. You will learn two
different ways to identify the steepness of an
object: the angle the object makes with the
ground and the tangent of that angle.
We hope you enjoy discovering the many ways of “looking at
an angle.”
Sincerely,
The Mathematics in Context Development Team

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