$10\sqrt{3}\ \text{cm}$10\sqrt{3}\ \text{cm}

$20\sqrt{3}\ \text{cm}$20\sqrt{3}\ \text{cm}

$(5+5\sqrt{3)}\ \text{cm}$(5+5\sqrt{3)}\ \text{cm}

$(15+5\sqrt{3)}\ \text{cm}$(15+5\sqrt{3)}\ \text{cm}