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A'EF AB is equal AC is equal ACD is greater adjacent angles angle ABC angle ACB angle BAC angle BCD angle contained angle DEF angle DFE angle EDF base BC bisects the angle centre circumference coincide const Construction DEF are equal Demonstration describe the circle draw a straight equal angles equal sides equal to CD equidistant equilateral triangle Euclid exterior angle Find a point four-sided figure given line given point given straight line interior opposite angle intersect isosceles triangle less Let ABC line with BC middle point opposite sides perpendiculars let fall plane point G position be named produced prop PROPOSITION Q.e.D. Exercises quadrilateral right angles shew shewn side AC sides equal straight line drawn take any point Theorem third side triangle ABC triangle DEF triangle EDA triangles be equal unequal vertical angle
Página 39 - IF two triangles have two sides of the one equal to two sides of the...
Página 4 - When a straight line standing on another straight line makes the adjacent angles equal to one another, each of the angles is called a right angle ; and the straight line which stands on the other is called a perpendicular to it.
Página 7 - If a straight line meet two straight lines, so as to make the two interior angles on the same side of it taken together less than two right angles...
Página 7 - Notions 1. Things which are equal to the same thing are also equal to one another. 2. If equals be added to equals, the wholes are equal. 3. If equals be subtracted from equals, the remainders are equal. 4. Things which coincide with one another are equal to one another.
Página 36 - If, from the ends of the side of a triangle, there be drawn two straight lines to a point within the triangle, these shall be less than, the other two sides of the triangle, but shall contain a greater angle.
Página 37 - ... shall be equal to three given straight lines, but any two whatever of these must be greater than the third.
Página 18 - Upon the same base, and on the same side of it, there cannot be two triangles that have their sides which are terminated in one extremity of' the base, equal to one another, and likewise those which are terminated in the other extremity.
Página 29 - If, at a point in a straight line, two other straight lines, upon the opposite sides of it, make the adjacent angles together equal to two right angles, these two straight lines shall be in one and the same straight line. At the point B in the straight line AB, let the two straight lines...