10th Grade Geometry
By Melissa Inforna
Table of Contents
 Welcome
 Setting up your calculator
 Basic parts of a right triangle
 Angles and Sides of a right triangle
 Welcome to SohCahToa
 Finding the ratio
 Mission #1
 Mission #2
 Mission #3
 Credits
Welcome!
 Congratulations! You have made it to a new area of
math; Right Triangle Trigonometry. You and your
partner are about to explore the beginnings of the
trigonometric functions! Please follow this WebQuest
page by page in order to get the full understanding of
this topic. Enjoy!
 Back to Table of Contents
Setting up your Calculator
 In order to use your calculator you must first tell it
what you are going to be doing. Please follow these
steps:
 Turn calculator on
 Hit Mode
 Go to where it says Radian Degree
 Put your cursor on Degree
 Hit Enter
 Hit 2nd Quit
 Back to Table of Contents
Basic parts of a Right Triangle
 There are 2 legs and a
hypotenuse
 The legs meet at the
right angle
 The hypotenuse is the
longest side and is always
across from the right
angle
 Back to Table of
Contents
Leg
Hypotenuse
Leg
Angles and Sides of a Right Triangle
 Angles are represented
by uppercase letters
 Sides are represented by
lowercase letters
 The angle’s side is always
opposite that angle. Ex:
Angle A has side a
opposite it.
 Back to Table of
Contents
A
c
b
C
a
B
Welcometo
SohCahToa
SohCahToa stands for:
Sin 
Opposite
Hypotenuse
Cos 
Adjacent
Hypotenuse
Tan 
Opposite
Adjacent
Take the first letter of the trig function and the first
letter of the sides of the ratio.
 Back to Table of Contents
Finding
the
Ratio
 Using the triangle at the
A
right we are going to fill
in the following values:
SinA 
O

H
CosA 
TanA 
A
3
5
H
5
O
3
A
4
 Back to Table of
Contents
4
4


5
C
3
B
Mission #1
 Using the Triangle on the previous slide complete the
following mission:
 Find the Sin, Cos, and Tan of Angle B
 Previous Slide: Click Here 
 This is to be completed on a separate sheet of paper and
shown to me before you continue!!
Mission #2
 Congratulations you have successfully completed your
first mission! Your second mission is as follows:
 Go to Mission 2 Final Project.doc
 Complete this ditto on a separate sheet of paper
showing all work!
 Hand in to me when completed
Mission #3
 This is to be done INDEPENDENTLY!!
 This is to be taken at the desk in the library away from
the computers!
 Print out this Exit Slip, complete and hand in for a quiz
grade.
 Exit Slip : Click Here 
Credits
 Ditto for Mission 2:
http://www.edhelper.com/math/trigonometry9.htm