double angle and half angle

Which of the following is an angle of half turn? => 180° or 360° or 270° or 90°..

Theorem: - If ABC is a triangle with sides a = BC, b = CA, c = AB, then prove that where 2s = a + b + ..

Angles - Fig.(i) Fig.(ii) Fig.(iii) Let OA and OB two half lines with common end point O. The half lines OA and OB are the sides of an angle and the point O is the vertex of the angle. An angle is an amount of rotation of a half-..

Reflex Angle : An angle whose measure is more than 180 o and less than 360 o is called a reflex angle..

When two straight lines meet at a point they form an angle..

When two straight lines meet at a common point, they form an angle. and are called arms of the angle BAC. The point 'A' is called the vertex. The angle formed by the two rays AB and AC is denoted by the symbol BAC. If there is only one angle at A, the..

Definition - When two straight lines meet at a point they form an angle. The point at which the arms meet (O) is known as the vertex of the angle. The amount of turning from one arm (OA) to other (OB) is called the measure of the angle ( AOB) and written as m AOB. An h..

To measure an angle we shall use two kinds of units, the degree unit and the radian unit. A degree(Sexagesimal system) is defined to be an angle formed by half-line (or a ray) rotated about its end point (1/360) of a complete revolution. Types of ..

Use half-angle formula to find the value of tan 15°. => 2 - 3 or 2 + 3 or 2 3 3 or 3 6..

Find the exact value of cos 75° using half angle formula. => 2 - 3 2 or - 2 - 3 2 or 2 + 3 2 or - 2 + 3 2..