Ad
related to: obtuse and acute trianglesIt’s an amazing resource for teachers & homeschoolers - Teaching Mama
- Guided Lessons
Learn new concepts step-by-step
with colorful guided lessons.
- Education.com Blog
See what's new on Education.com,
explore classroom ideas, & more.
- 20,000+ Worksheets
Browse by grade or topic to find
the perfect printable worksheet.
- Digital Games
Turn study time into an adventure
with fun challenges & characters.
- Guided Lessons
Search results
Results from the WOW.Com Content Network
An obtuse triangle (or obtuse-angled triangle) is a triangle with one obtuse angle (greater than 90°) and two acute angles. Since a triangle's angles must sum to 180° in Euclidean geometry , no Euclidean triangle can have more than one obtuse angle.
In obtuse-angled triangles the square on the side subtending the obtuse angle is greater than the squares on the sides containing the obtuse angle by twice the rectangle contained by one of the sides about the obtuse angle, namely that on which the perpendicular falls, and the straight line cut off outside by the perpendicular towards the ...
A triangle in which one of the angles is a right angle is a right triangle, a triangle in which all of its angles are less than that angle is an acute triangle, and a triangle in which one of it angles is greater than that angle is an obtuse triangle. [8] These definitions date back at least to Euclid. [9]
Isosceles triangles commonly appear in architecture as the shapes of gables and pediments. In ancient Greek architecture and its later imitations, the obtuse isosceles triangle was used; in Gothic architecture this was replaced by the acute isosceles triangle. [8]
The faces are isosceles triangles with one obtuse and two acute angles. The obtuse angle equals arccos(– 7 / 18 ) ≈ 112.885 380 476 16 ° and the acute ones equal arccos( 5 / 6 ) ≈ 33.557 309 761 92 °.
A corollary of the Pythagorean theorem's converse is a simple means of determining whether a triangle is right, obtuse, or acute, as follows. Let c be chosen to be the longest of the three sides and a + b > c (otherwise there is no triangle according to the triangle inequality ).
Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!
This list of triangle topics includes things related to the geometric shape, ... Acute and obtuse triangles; Altitude (triangle) Area bisector of a triangle;
Ad
related to: obtuse and acute trianglesIt’s an amazing resource for teachers & homeschoolers - Teaching Mama