You Can prove that radius to the point of contact of a tangent is perpendicular by

Take two Iron Rings with a radius of a pin that you have like a stitching needle.. The iron rings should be at a thickness of 1 cm... Join the two rings by superimposing but not exactly, without gap. just leave a gap between the two circumference of the circle such that there is parallel gap throughout the two rings then join them at two points{one at any where and another at straight opp to the other} using m~seal. no find the center by drawing a circle with same radius with compass.(no need to measure the radius just estimate the radius by having the ring)then keep the rings on it and then take a wire make it as the diameter with the contact points as the point where you joined the two circles no try to fix a pin from the center of that dia's length then take a piece of magnet of a length 1cm and 1 cm width add a pipe or some thing to extend it so now this magneted pipe is the tangent and keep it on the rings' surface then the pin get attracted at the tangent at 90degree ....

Making a Maths Trigonometry working Model
Posted Date: Total Responses: 0 Posted By: Nishant Rai Member Level: Silver Points/Cash: 30 | |
Design of Theodolite:

This model is a working model and you should read this if you are searching for a quick maths model to make. Its related to trigonometry. The name of this device is theodolite. It has the same use as that of a clinometer but it is made differently. I A theodolite is an instrument used for determining the horizontal and vertical angles between two points.

Material Required

• Protractor
• Piece of wood or cardboard wider than the protractor
• Push pin or nail
• Hammer (optional)
• String
• Small weight

Steps:

1. Align the center of the flat edge of the protractor with the centre of the long edge of the wood or...

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