Чему равна сумма углов: \(\displaystyle 18^{\prime}+12^{\circ}27^{\prime}57^{\prime \prime}\)?

• \(\displaystyle 12^{\circ}45^{\prime}57^{\prime \prime}\)
• \(\displaystyle 12^{\circ}45^{\prime}55^{\prime \prime}\)
• \(\displaystyle 18^{\circ}45^{\prime}27^{\prime \prime}\)
• \(\displaystyle 12^{\circ}18^{\prime}45^{\prime \prime}\)