 | Competency-based education - 1999 - 116 pages
...properties of triangles • The sum of the interior angles of any triangle is 1 80C AAA a+b+ c=180° • In an isosceles triangle the angles opposite the equal sides are equal. AA a=b The angles of an equilateral triangle are all equal. AAA 13. In the space below draw the following... | |
 | 288 pages
...2, 3, 4, it follows that the remaining elements in any such pair are equal also. 82. Proposition 3. In an isosceles triangle the angles opposite the equal sides are equal. Let ABC (Fig. 35) be an isosceles triangle in which AB = AC. It is required to prove that LB = LG. Construction.... | |
 | S. N. Forrest - Mathematics - 1947 - 444 pages
...triangle ABC. This is called the ambiguous case, and is studied more fully in Book II. To prove that, in an isosceles triangle, the angles opposite the equal sides are equal. Data: Triangle ABC in which AC = BC (fig. 67). It is required to prove that angle A = angle B. Construction.... | |
 | Brian Lasater - History - 2008 - 600 pages
...proposition that even obvious propositions needed proof. Thales Theorem (Euclid's 5th theorem) that in an isosceles triangle, the angles opposite the equal sides are equal. In the Middle Ages, this theorem was named the Bridge of Asses or Pons Asinorum, for the student who... | |
 | 298 pages
...The area of the path is one-sixth of the area of the court. Find the width of the path. 6. Prove that in an isosceles triangle the angles opposite the equal sides are equal. In the quadrilateral A BCD the sides AB and AD are equal, and the side BC = the diagonal BD. Prove... | |
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In an isosceles triangle, the angles opposite the equal sides are equal. Let ABC be an isosceles triangle, in which the side AB is equal to the side AC ; then will the angle B be equal to the angle C. 
