The best way to measure an angle is to use a protractor. To do this, you'll start by lining up one ray along the 0-degree line on the protractor. Then, line up the vertex with the midpoint of the protractor. Follow the second ray to determine the angle's measurement to the nearest degree
Equation of a tangent line of a curve is: y- y0 = f´ (x0) (x - x0 ). In this case: x0=1, y0=1 f´(x)=(Derivation) f´(x0)= y - 1 = 1/2 ( x - 1 ) y - 1 = 1/2 x - 1/2 y = 1/2 x - 1/2 + 1 y =