極座標と直交座標

問題次の問いに答えよ。
\({\small (1)}~\)次の極座標を図示し、直交座標で表せ。$$~{\large ①}~{\rm A}\left(2~,~\frac{\,\pi \,}{\,3 \,}\right)~~~~~~\,{\large ②}~{\rm B}\left(4~,~-\frac{\,\pi \,}{\,4 \,}\right)$$$$~{\large ③}~{\rm C}\left(3~,~\frac{\,3 \,}{\,2 \,}\pi\right)~~~~{\large ④}~{\rm D}(1~,~\pi)$$\({\small (2)}~\)次の直交座標を極座標で表せ。$$~{\large ①}~{\rm E}(-1~,~1)~~~~~~{\large ②}~{\rm F}\left(3~,~\sqrt{3}\right)$$$$~{\large ③}~{\rm G}(0~,~4)~~~~~~~~{\large ④}~{\rm H}(2~,~0)$$