# Test: Trigonometric functions I - Normal

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Question 1:   Convert $\text{\hspace{0.17em}}25°\text{\hspace{0.17em}}$ to radians.
$\frac{\pi }{2}$
$\frac{5\pi }{36}$
$\frac{7\pi }{36}$
$\frac{2\pi }{3}$
Question 2:   Convert $\text{\hspace{0.17em}}\frac{11\pi }{6}\text{\hspace{0.17em}}$ to degrees.
$45°$
$225°$
$270°$
$330°$
Question 3:   A radian measure of an $\text{\hspace{0.17em}}arc\left(\alpha \right)\text{\hspace{0.17em}}$ in a circle equals $\text{\hspace{0.17em}}\frac{3\pi }{4}\text{\hspace{0.17em}}$ while radius $\text{\hspace{0.17em}}\left(R\right)\text{\hspace{0.17em}}$ equals  $5cm$ .  What is the length $\text{\hspace{0.17em}}\left(l\right)\text{\hspace{0.17em}}$ of this arc?
$\text{\hspace{0.17em}}\frac{4\pi }{15}\text{\hspace{0.17em}}$
$\text{\hspace{0.17em}}\frac{15\pi }{4}\text{\hspace{0.17em}}$
$\text{\hspace{0.17em}}\frac{3\pi }{20}\text{\hspace{0.17em}}$
$\text{\hspace{0.17em}}\frac{20\pi }{3}\text{\hspace{0.17em}}$
Question 4:   Solve the expression $\text{\hspace{0.17em}}3tg180°-4ctg90°\text{\hspace{0.17em}}$.
$0$
$-1$
$-7$
$3$
Question 5:   Solve the expression $\text{\hspace{0.17em}}\mathrm{cos}\left(-60°\right)+ctg\left(-45°\right)\text{\hspace{0.17em}}$ .
$-1$
$-\frac{1}{2}$
$1$
$0$
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