PROPOSITIONS 1-26, BOOK I, ARE NOW PUBLISHED IN A SIMILAR FORM TO THIS.

PROPOSITION XVIII.

The greater side of every triangle is opposite to the greater angle.

Let

be a triangle, of which the side

Then the angle

is greater than the side shall be greater than the angle

PROPOSITIONS 1-26, BOOK I, ARE NOW PUBLISHED IN A SIMILAR FORM TO THIS.

Let

Then any

PROPOSITION XVII.

Any two angles of a triangle are together less than two right angles.

be any triangle.

two of its angles together shall be less than two right angles.

In like manner it may be demonstrated, that the angles

two right angles, as also the angles

Therefore any two angles of a triangle, &c.

are less than