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angles in a triangle

45-45-90 Triangles

By Harish Appana Satya on April 28, 2013

The ratios of the 45-45-90 triangle will be derived using the Pythagorean Theorem. The properties of the special triangles can then be applied to the trigonometric ratios of sine and cosine.

Posted in sec_mat_tri | Tagged 45-45-90, angles in a triangle, diagonals, geometry, math 11-12, Pythagorean theorem, ratios, right angle triangle, triangles

<a href="https://scienceres-edcp-educ.sites.olt.ubc.ca/2013/04/28/30-60-90-triangles/" title="30-60-90 Triangles"><img src="https://scienceres-edcp-educ.sites.olt.ubc.ca/files/2013/04/sec_math_tri_306090-150x150.jpg" alt="30-60-90 Triangles" class="thumbnail thumbnail " /></a>

30-60-90 Triangles

By Harish Appana Satya on April 28, 2013

The ratios of the 30-60-90 triangle will be derived using the Pythagorean Theorem. The ratios when the be applied to quickly find the side lengths of any 30-60-90 triangle.

Posted in sec_mat_tri | Tagged 30-60-90, angles in a triangle, dimensions, equilateral triangle, geometry, math 11-12, Pythagorean theorem, ratios, right angle triangle, scaling factor, triangles, unit circle

<a href="https://scienceres-edcp-educ.sites.olt.ubc.ca/2012/08/01/polygon-angles/" title="Polygon Angles"><img src="https://scienceres-edcp-educ.sites.olt.ubc.ca/files/2012/08/elem_math_shapeandspace_polygonangles-150x150.jpg" alt="Polygon Angles" class="thumbnail thumbnail " /></a>

Polygon Angles

By Harish Appana Satya on August 1, 2012

This problem set deals with the internal and external angles of the polygons up to an octagon.

Posted in elem_mat_sas | Tagged angles, angles in a triangle, elementary math, external angles, internal angles, polygons, primary math, rectangles, shape, shape and space

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