This fact is the content of the isosceles triangle theorem, which was known by Euclid. To calculate the properties of an isosceles triangle when given certain information, you can use the Pythagorean theorem, the Law of Cosines, or the Law of Sines. note 1 5 An isosceles triangle also has two angles of the same measure, namely the angles opposite to the two sides of the same length. An isosceles triangle is a triangle where two sides have the same length. Sometimes it is specified as having exactly two sides of equal length. Try this Drag the orange dots on each vertex to reshape the triangle. For any three similar shapes of area on the sides of a right triangle, (2) which is equivalent to the Pythagorean theorem. In geometry, an isosceles triangle is a triangle that has two sides of equal length. A triangle which has two of its sides equal in length. It has two equal angles, that is, the base angles. Sometimes it is specified as having exactly two sides of equal length, and sometimes as having at least two sides of equal length, the latter version thus including the equilateral triangle as a special case. 'equal legs') has two sides of equal length. Special cases of the right triangle include the isosceles right triangle (middle figure) and 30-60-90 triangle (right figure). Some pointers about isosceles triangles are: It has two equal sides. In geometry, an isosceles triangle ( / assliz /) is a triangle that has two sides of equal length. \) resembles a bridge which in the Middle Ages became known as the "bridge of fools," This was supposedly because a fool could not hope to cross this bridge and would abandon geometry at this point. An isosceles triangle ( Greek:, romanized : isoskels, lit.
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