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From Karnataka Open Educational Resources
Classification of triangles (view source)
Revision as of 06:52, 6 December 2013
, 06:52, 6 December 2013no edit summary
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+'''Right Isosceles Triangle :'''
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−[[Image:KOER%20Triangles_html_m37b6213c.png]]Has
−a right angle (90°), and also two equal angles
−Can you guess what
−the equal angles are?
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−[[Image:KOER%20Triangles_html_9fb9ff3.png]]
==Acute angled triangle. ==
==Acute angled triangle. ==
−A triangle whose all
+A triangle whose all angles are acute is called an acute-angled triangle or simply an acute triangle.
−angles are acute is called an acute-angled triangle or simply an acute triangle.
[[Image:KOER%20Triangles_html_m62898a77.png]]
[[Image:KOER%20Triangles_html_m62898a77.png]]
−[[Image:KOER%20Triangles_html_m732d9c3d.png]]A right triangle has one angle 90°
+==Right angle triangle==
−[[Image:KOER%20Triangles_html_m732d9c3d.png]] A right triangle has one angle 90°
−==Right Isosceles Triangle==
[[Image:KOER%20Triangles_html_m37b6213c.png]]
−=The Obtuse Triangle=
+If a triangle has a right angle (90°), and also two equal angles, can you guess what the equal angles are?
+==The Obtuse Triangle==
[[Image:KOER%20Triangles_html_15a07649.png|Obtuse Triangle]]
[[Image:KOER%20Triangles_html_15a07649.png|Obtuse Triangle]]
The Obtuse Triangle has an obtuse angle (an obtuse angle has more than 90°). In the picture on the left, the shaded angle is the obtuse angle that distinguishes this triangle. Since the total degrees in any triangle is 180°, an obtuse triangle can only have one angle that measures more than 90°.
The Obtuse Triangle has an obtuse angle (an obtuse angle has more than 90°). In the picture on the left, the shaded angle is the obtuse angle that distinguishes this triangle. Since the total degrees in any triangle is 180°, an obtuse triangle can only have one angle that measures more than 90°.
−=Angles in a triangle=
−== Interior angles of a triangle ==
== Interior angles of a triangle ==
The interior angles are
+The interior angles are those on the inside of the triangle.
−those on the inside of the triangle.
−[[Image:KOER%20Triangles_html_m55b3a2cf.png]]
[[Image:KOER%20Triangles_html_m55b3a2cf.png]]
−== Exterior Angles of a triangle ==
== Exterior Angles of a triangle ==
An exterior angle is formed by extending any side
+An exterior angle is formed by extending any side of the triangle.
−of the triangle.
+[[Image:KOER%20Triangles_html_9fb9ff3.png]]
−'''Image Acknowledgement: Mathsisfun.com'''
−
