An angle that has a magnitude, as well as the direction of rotation, is known as the directed angle. An angle in the figure is formed by two rays called the initial ray and terminal ray, with a common initial point called a vertex.
If the rotation from the initial ray to the terminal ray is clockwise it is to be taken as positive and if it is anti-clockwise, rotation is to be taken as negative. Each trigonometrical ratio is a real number and has no units.
Trigonometrical Identities PDF
Please wait while flipbook is loading. For more related info, FAQs and issues please refer to DearFlip WordPress Flipbook Plugin Help documentation.