Inscribed angle "V" and whose sides pass through points "A" and "B". Draw line "OA". Angle "BOA" is a central angle; call it "θ". Lines "OV" and "OA" are both radii of the circle, so they have equal lengths. Therefore, triangle "VOA" is isosceles, so angle "BVA" (the inscribed angle) and angle "VAO" are equal; let each of them be denoted as "ψ". Angles "BOA" and "AOV" are supplementary. They add up to 180°, since line "VB" passing through "O" is a straight line. Therefore, angle "AOV" measures 180° − "θ". It is known that the three angles of a triangle add
Etiquette in Japan from the waist with the back and neck straight, hands at the sides (males) or clasped at the lap (females), and eyes looking down. The body should be composed but not rigid. Generally, the longer and deeper the bow, the stronger the emotion and respect expressed. The three main types of bows are informal, formal, and very formal. Informal bows are made at about a fifteen-degree angle or just tilt over one's head to the front, and more formal bows at about thirty degrees. Very formal bows are deeper. The etiquette surrounding bowing, including the length, depth, and appropriate response,