# For this slope planter, it helps if you remember geometry.

For this slope planter, it helps if you remember geometry Remember any high school geometry? This planter--designed by Oakley Norton of Eagle Rock, California, to add interest and increase planting space on his sloping lot--presents a refresher course in parallelograms and equilateral triangles.

Construction is simpler than it looks. All boards for the stepped wall next to the lawn and the angled dividers across the planter are redwood 2-by-4s set on edge. Joints were toenailed or end-nailed; the stacked 2-by-4s were toenailed to each other.

The long outside wall, 4 feet 6 inches away from the house, starts on the downhill side with three boards that run into the slope. Every 32 inches, two more rows of boards, with their downhill ends cut at a 60[degrees] angle, go on top.

Attached to the lower board's 60[degrees] end is a 64-inch-long divider, its ends also cut at 60[degrees]. The joined boards make a 120[degrees] angle from the outside wall across the bed to the house, forming two sides of a parallelogram (the house wall and the edge of the adjacent tier form the other two sides).

The upper of the stacked boards, 32 inches long, angles in at 60[degrees] to create an equilateral triangle; this forms a raised planting bay within the parallelogram. If the math is all too much, you can just wing it. Adjust the shoe on your circular saw to 30[degrees], cut the boards, and position them as pictures above. If the joints butt together correctly, you'll come up with the same structure.