# Height and Distance ( Model 1)

## Introduction(परिचय)

Height and distance is the branch of trigonometry. Its main application is to find the height of any objects like tree, building, mountain, pole, tower etc and the distance between two objects like distance between two edges of the river(i.e, width). This method is very useful in surveying, making map, astronomy etc.

## Learning Objective (सिकाई उपलब्धी)

To understand how and what determines the angle of elevation and angle of depression, the students will investigate the height if distance is given. They will be able to experiment in finding the height of a any object by changing the angle when distance is fixed

## User Guideline

प्यारा भैबहिनिहरु तल दिएको Applet मा रहेका Button र Slider को कम निम्नानुसार रहेको छ।
• Steps = याे slider लाई Drag गरेर Figure मा आउने परिवर्तन का साथै Solution Steps अवलोकन गर्नुहोस ।
• Distance = याे slider लाई Drag गरेर Distance मा आउने परिवर्तन गर्नुहोस ।
• Angle of elevation = याे slider लाई Drag गरेर Angle मा परिवर्तन गर्नुहोस ।
• Next = याे Button लाई click गरेर पनि Steps परिवर्तन गर्न सक्नुहुन्छ ।
• ON = याे Button लाई click गरेर Step परिवर्तन लाई automation मा लान सक्नुहुन्छ ।
• OFF = याे Button लाई click गरेर automatic Step परिवर्तन लाई रोक्न सक्नुहुन्छ ।
After the process, answer the question given at the bottom of this applet.

The angle of elevation of the top of a tower observed from a point 50 m away is 60°. Which of the following is the height of the tree ?

Select all that apply
• A
• B
• C
• D