trigonometric ratios

# Radian

**Radian** is the measure of an angle whose vertex is the centre of the circumference and it makes an arc with the same length as the radius

π rad = 180^{o}

**Exercise**: change the radians into degrees or viceversa:

a) 34^{o} 15' 17''

b) 135^{o}

c) 3π/2

d) 5π/3

Solutions: a) 0,597 rad; b) 3π/4 rad; c) 270^{o}; d) 300^{o}

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