When you purchase fabric, it’s folded in half lengthwise. Unfold the nylon and refold it in half crosswise (cut ends together) to create a 60-inch square.

To make a 60-inch-radius halfcircle for the tepee shell, mark a quarter- circle on the folded fabric using a pencil and measuring tape: Lay the measuring tape down between two diagonal corners and draw a 60-inch-long line measured from the folded corner (this is the radius).

Then, starting from the adjacent folded corner, draw a quarter-circle, arcing around the end of the line and ending at the opposite corner.

It may help to mark the curve of the quarter-circle with string secured by pushpins. Cut out the quarter-circle and unfold the fabric.

Cut out two 1½-inch-diameter and two 8-inch-diameter yellow-cotton circles (figures B and C); they’re easier to cut if you fold the fabric into quarters. Remove the paper backing.

Bond the 1½-inch circles onto opposite sides of the tepee opening, 22 inches up from the bottom and 11 inches in from the opening edges (on radius marks). Bond the 8-inch circles 10½ inches (on center) away from the little circles as shown.

Cut out twelve 3-inch-tall yellow triangles (see figure D). Cut one triangle in half lengthwise and apply the halves to the two opening edges at the bottom of the tepee; bond. Apply the 11 remaining triangles to the bottom edge of the tepee at the six radius marks and halfway between each pair of marks.