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
But we also know the angles in the triangle add to 180 o: , so . Since and are both equal to , they are equal to each other by the transitive property: . Here is an obvious result that follows immediately: Corollary to the Exterior Angle Theorem. The measure of an exterior angle is always greater than the measure of either remote interior angle. Proof: In the above setup, . If we drop one of the measures on the right, we have or since angles always have positive measure. Relation between Angles and Sides of a Triangle