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.

One more contribution from the students.

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

Expose your learners to 'degenerate' triangles.

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

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

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.

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)?
In this note we discuss the conditions that must be satisfied by the sides of an arbitrary integer-sided triangle if its medians can serve as the sides of a right-angled triangle.


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