Assignment

Assignment 7

Rotate a triangle A(-10,10), B (-10,5), C(-5,10) by 90 ° about the origin.

Introduction

A triangle ABC with vertices A(-10,10), B (-10,5), C(-5,10) .Rotate triangle ABC around O by 90° anticlockwise direction.

Objective

Students will beable to find the visual experience on rotate a triangle .

User guideline

Construct a triangle ABC with vertices A(-10,10), B(-10,5) , C(-5,10) ,
Create new point O(0,0) by using input bar ,
Create a slider α with min 0 and max 90° and increment to 1,
To rotate triangle ABC around O by α , write command Rotate(triangle,α,O) in input bar ,
Join OA and OA',
Create circular sector by using circular arc OAA',
Join AA',BB'and CC',
Create angle AOA'= by using angle tool,
Move slider to see rotation.

GGB Applet

Test your understanding:-

While rotating triangle ,the shape of triangle is changed ?

Select all that apply

A
Yes
B
No

Rotate a triangle ABC around O by 90° anticlockwise direction by using following protocol .

1.Create three points A=(-10,10), B=(-10,5),C=(-5,10) using input Bar , 2. Create a triangle ABC using polygon too , 3. Create a new point O=(0,0) using input Bar, 4. Create a slider for angle α=(0,90°,1) using slider tool, Hint: In the Slider dialog window check a. Select Angle for the slider type b. Name α for the slider c. Give minimum value 0°, maximum value 90°, and Increment to 1°. Make sure you don’t delete the ° symbol, 5. Rotate triangle ABC around O by α. Hint: write the command Rotate(triangle, α, O) in input Bar, 6. Create segments AO and A'O, 7. Create sector OAA' using circular arc tool. Hint: Select the points in anticlockwise order, 8. Move slider and check the image of the triangle .