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Template; Talk; English. Read; Edit; View history; Tools. Tools. ... The altitude of a right triangle from its right angle to its hypotenuse is the geometric mean of ...
A right triangle ABC with its right angle at C, hypotenuse c, and legs a and b,. A right triangle or right-angled triangle, sometimes called an orthogonal triangle or rectangular triangle, is a triangle in which two sides are perpendicular, forming a right angle (1 ⁄ 4 turn or 90 degrees).
The apparent triangles formed from the figures are 13 units wide and 5 units tall, so it appears that the area should be S = 13×5 / 2 = 32.5 units. However, the blue triangle has a ratio of 5:2 (=2.5), while the red triangle has the ratio 8:3 (≈2.667), so the apparent combined hypotenuse in each figure is actually bent.
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Those triangles can then be further subdivided into smaller triangles for new geodesic polyhedra. All vertices are valence-6 except the 12 centered at the original vertices which are valence 5. A geodesic polyhedron is a convex polyhedron made from triangles.
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Date/Time Thumbnail Dimensions User Comment; current: 18:26, 13 April 2007: 160 × 160 (8 KB): Inductiveload {{Information |Description=Diagram to show that the circumcentre of a right triangle is inside the triangle.