After it dried, which took about two hours, I sanded it flush with the wood using #120-grit sandpaper, then stained the entire shelf. You have to look closely to see the spot where the nail hole had been! Quick Tip: Always sand in the direction of the grain of the wood to avoid unsightly scratches.
In the picture below, the angles â ABC, â BCA and â CAB are the three interior angles of the triangle. An exterior angle is formed by extending one of the sides of the triangle; the angle between the extended side and the other side is the exterior angle. In the picture, angle â ACD is an exterior angle. Euclid's exterior angle theorem
An exterior angle for a polygon is formed by extending one side of the polygon from one if its endpoints. From this, we see that an exterior angle and interior angle form a linear pair of angles. If you extend each side of a polygon to form one exterior angle at each vertex, you get a set of exterior angles. This conjecture tells us that the sum of a set of exterior angles is 360 degrees. This result, all by itself is not so exciting. The resulting corollaries about regular polygons are much more interesting. For example, the first corollary gives a formula for finding the measure of an exterior angle to a regular n-gon.