Teacher development

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How to Prove It: Contradiction and ContrapositiveArticle | By At Right Angles | Aug 09, 2019  | Mathematics | 0 Likes

In this episode of “How To Prove It”, we consider two similar sounding terms which have great significance in higher mathematics: contradiction and contrapositive.

Can there be SSA congruence?Article | By At Right Angles | Aug 09, 2019  | Mathematics | 0 Likes

If two sides of a triangle have the same lengths as two sides of another triangle, and one angle of the first triangle has the same measure as one angle of the second

Fun with Dot SheetsArticle | By At Right Angles | Aug 09, 2019  | Mathematics | 0 Likes

The ‘TearOut’ series is back, with perimeter and area. Pages 1 and 2 are a worksheet for students, while pages 3 and 4 give guidelines for the facilitator.

'CuRe' TRIPLETSArticle | By At Right Angles | Aug 09, 2019  | Mathematics | 0 Likes

O n observing the triple (25, 125, 225) in which 125 is a perfect cube, 25 and 225 are perfect squares, and the three numbers are in arithmetic progression (AP), I fel

Understanding Learners' Thinking through an Analysis of ErrorsArticle | By At Right Angles | Aug 09, 2019  | Mathematics | 0 Likes

In this article, I have argued that it is important not to bunch all the students’ errors as “careless mistakes” or “over-generalisations”.

A path to πArticle | By At Right Angles | Aug 09, 2019  | Mathematics | 0 Likes

Consider the following situation. A regular polygon of n sides is placed symmetrically inside another regular polygon of n sides i.e.

Radii of In-circle and Ex-circles of a Right- Angled TriangleArticle | By At Right Angles | Aug 09, 2019  | Mathematics | 0 Likes

In this article, I provide a relation connecting the lengths of the tangents from the vertices of a right-angled triangle to its incircle and ex-circles, in terms of i

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Teacher Development