Find the radius of the glass to the nearest tenth.

Question

A straw that is 12 cm leans against the inside of a glass. 3 cm of the straw extends beyond the glass. The height of the glass is 7.5 cm.

 

Answer 1

9 cm of the straw is in the glass (12cm - 3 cm)

This is the hypotenuse. 

One leg is 7.5 cm.

The other leg is the diameter of the glass

 

9² = 7.5² + d²

 

Can you calculate d?