6. Streamline moderne designs often contain which of the following shapes?

A. boomerang
B. Bullet
C. Kidney
D. Star

A. Boomerang

Streamline moderne designs often contain the following shapes:

A. Boomerang
C. Kidney
D. Star

To determine which shapes are often found in streamline moderne designs, we can start by understanding what streamline moderne is. Streamline moderne is an architectural style that emerged in the 1930s and 1940s in response to the influence of aerodynamics and industrial design. It is characterized by smooth, curved, and streamlined forms, taking inspiration from transportation and machinery of that era.

Now, let's examine each option to see which shapes are commonly associated with streamline moderne designs:

A. Boomerang: The boomerang shape is often seen in streamline moderne designs. Its curved and tapered form fits well with the streamlined aesthetics.

B. Bullet: The bullet shape, as its name suggests, is streamlined and hence fits the design philosophy of streamline moderne. It is typically long and narrow, resembling the shape of a bullet.

C. Kidney: While the kidney shape may not be as prevalent as the boomerang or bullet, it has been used in some streamline moderne designs. This shape is rounded and tapering, similar to the other shapes typically found in this style.

D. Star: The star shape is not commonly associated with streamline moderne designs. Streamline moderne tends to focus more on smooth and curved forms rather than angular shapes like a star.

Based on this analysis, the correct answer would be:
A. Boomerang
B. Bullet
C. Kidney