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
Remote interior angles. An exterior angle is an angle on the outside of a triangle formed by extending one of the triangle's sides. Each interior angle of a triangle has two remote exterior angles and an adjacent interior angle. The remote interior angles are the two angles inside the triangle that do not share a vertex with the exterior angle. The measure of an exterior angle is equal to the sum of the measures of its two remote interior angles.