Basics of Geometry

Point

Line

Angle

Plane

Circle

Parallel line

Line segment

Ray

Use a compass and join points to make the new leg of the congruent triangle.

Use a straightedge to measure the width between the points where the first arc cuts both legs of the given angle.

Use a straightedge and draw an arc across the first arc from a leg.

Use a compass and draw an arc across both legs of the given angle.

Mark the intersection point of the two arcs, and draw a ray from the vertex through the intersection point.

Swing an arc that intersects both rays of an angle.

Mark the intersection points of the rays and the arc.

Place the compass on one of these intersection points, and draw an arc inside the angle.

3

5

7

2

Draw line FG.

Mark the points of intersection between Circle A and Line AB.

Create circle B with radius AB.

Draw point E anywhere on segment DB.