3 Mixed up Maths and General knowledge

What would you do with a Zither

A rectangle has a perimeter of 20cm and a width of 3cm. What is it's length?

How many degrees in a Pentagon?

Where in the world would you find Tundra

3x-15=21 so x=?

A right angled triangle contains an angle of 23 degrees. What is the third angle?

The Pirates of the Caribbean was set in Cartagena. In which country is Cartagena?

How many sides does a dodecagon have?

What is Mondongo soup made of?

Where does Caerpilly cheese come from