# triangle

## A Triangle Problem

Solve this: Two sides of a triangle have lengths 6 and 10, and the radius of the circumcircle of the triangle is 12. Find the length of the third side.

## An investigation with TRIANGLES & CIRCLES

One more contribution from the students.

## Identifying and Constructing Triangles

Get introduced to triangles, in this presentation by Swati Sircar from Shikshamitra - what they are, what they aren't, the parts that make up a triangle and the different types of them

## Congruence and Constructibility in triangles

Expose your learners to 'degenerate' triangles.

## How to Prove it Ptolemy's Theorem

In the how to prove it series, we are looking at the Ptolemy's Theorem.

## Circle Time

This time the Low Floor, High Ceiling series focuses on regular polygons inscribed in circles.

## Low floor High ceiling Try-Angles

In this issue’s task we work with right-angled triangles, isosceles as well as scalene. The activity has enormous scope for creativity, visualisation, investigation, pattern recognition, documentation and conjecture. Facilitators should encourage students to come up with proofs for conjectures that they make.

## 3,4,5 And other memorable triples Part III

In the 3rd part of the series, we are trying to find all triples (a, b, c) of coprime positive integers satisfying the property a2 = b(b + c). What solutions does the equation have (in coprime positive integers) other than (a, b, c) = (6, 4, 5)?