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In an isosceles triangle the angles opposite the equal sides are equal.
Elements of Plane and Solid Geometry - Page 46
by George Albert Wentworth - 1877 - 398 pages

## Principles of Plane Geometry

James Wallace MacDonald - Geometry - 1889 - 80 pages
...triangle is equal to the sum of the two opposite interior angles. Proposition XXXIV. A Theorem. 71. In an isosceles triangle the angles opposite the equal sides are equal. Proposition XXXV. A Theorem. 72. If two angles of a triangle are equal, the sides opposite these angles...

## Principles of Plane Geometry

James Wallace MacDonald - Geometry - 1894 - 76 pages
...triangle is equal to the sum of the two opposite interior angles. Proposition XXXIV. A Theorem. 71. In an isosceles triangle the angles opposite the equal sides are equal. COROLLARY. An equilateral triangle is also equiangular. Proposition XXXV. A Theorem. 72. If two angles...

## Exercise Manuals, Issue 3

George Albert Wentworth - 1889 - 270 pages
...each. 39. Corollary. Two right triangles are equal if their legs are equal, each to each. 40. Theorem. In an isosceles triangle the angles opposite the equal sides are equal. 41. Corollary. An equilateral triangle is equiangular. 42. Theorem. If in a triangle two angles are...

## Wentworth & Hills's Exercise Manuals: Geometry, Issue 3

George Albert Wentworth - 1889 - 264 pages
...each. 39. Corollary. Two right triangles are equal if their legs are equal, each to each. 40. Theorem. In an isosceles triangle the angles opposite the equal sides are equal. 41. Corollary. An equilateral triangle is equiangular. 42. Theorem. If in a triangle two angles are...

## The Elements of Plane and Solid Geometry ...

Edward Albert Bowser - Geometry - 1890 - 418 pages
...hypotenuse and an acute angle of the other. 107. COR. 2. Two right-angled triangles are equal when a side and an acute angle of the one are equal respectively to a side and homologoiis acute angle of the other. Proposition 23. Theorem. 108. Two triangles are equal...

## The Ohio Educational Monthly and the National Teacher: A Journal ..., Volume 39

Education - 1890 - 776 pages
...four hypotheses regarding two straight lines from which they can be proved parallel. 4. Prove that in an isosceles triangle the angles opposite the equal sides are equal. 5. When are polygons mutually equiangular ? Explain the term homologous sides. 6. To what is the sum...

## The Elements of Plane and Solid Geometry: With Numerous Exercises

Edward Albert Bowser - Geometry - 1890 - 420 pages
...triangle is 40° 14' 48", what is the value of the other acute angle ? Proposition 25. Theorem. 111. In an isosceles triangle the angles opposite the equal sides are equal. Hyp. Let ABC be an isosceles A having AC = BC. To prove /_ A = Z B. Proof. Draw the line CD from the...

## The Colliery Engineer Pocket-book of Principles Rules, Formulę, and Tables ...

Thomas J. Foster - Coal mines and mining - 1891 - 456 pages
...greater side is opposite the greater angle, and the greater angle is opposite the greater side. 7. In an isosceles triangle the angles opposite the equal sides are equal. 8. In any triangle the sum of the three angles is equal to two right angles, or 180°. 9. If two angles...