Why did klutz lift off a manhole cover and dive in

Determine the relationship of ab and cd given the following points

The volume of gas a balloon can hold varies directly as the cube of its radius. imagine a balloon with a radius of 3 inches can hold 81 cubic inches of gas. how many cubic inches of gas must be released to reduce the radius down to 2 inches?

Which statements are true about additional information for proving that the triangles are congruent check all that apply