With ladder $18$ m and ground angle $45^\circ$, the height of the wall equals—

Question

Accepted Answer

$18 \cdot \sin 45^\circ$

Answer

$18 \cdot \cos 45^\circ$

Answer

$18 \cdot 	an 45^\circ$

Answer

$\dfrac{18}{\sin 45^\circ}$

With ladder 181818 m and ground angle 45∘45^\circ45∘, the height of the wall equals—