Triples - Sharp EL-531RH Teachers Manual

Triples

• • • • • • • • • • • • • • • • • • • • • Objective • • • • • • • • • • • • • • • • • • • • •
Understand and use Pythagoras' theorem.
Use coordinate systems to specify location.
• • • • • • • • • • • • • • • Explanation of the activity • • • • • • • • • • • • • •
Working on this activity will reinforce students' understanding of Pythagoras' theorem, and develop
their knowledge of Pythagorean triples. It will also develop their appreciation of different ways of
specifying position, including rectangular Cartesian coordinates and polar coordinates.
• • • • • • • • • • • • • • • • • Using the calculator • • • • • • • • • • • • • • • • •
Press the following buttons and then start operation.
(Repeat until the DEG symbol appears)
<Example using the EL-531RH>
Try to find the length of the hypotenuse (the side
opposite the right angle) of a right triangle whose
other two sides are 3 cm and 4 cm long.
Input the lengths of the two shorter sides.
3
Find the length of the hypotenuse.
We find that the length of the hypotenuse is 5 cm.
Extra:
Try to find the angle of the corner between the
hypotenuse and the base.
We find that this angle is 53.13010235˚.
Let's find the hypotenuses of right triangles having
various bases and heights.
Calculator functions used: Coordinate conversion
4
3,
r=
53
High school
DEG
DEG
DEG
=