Answer:
D. 32 sq. unit s
Step-by-step explanation:
4×18/2=32
I’m pretty sure it would be B.
Answer:
Step-by-step explanation:
These are geometric means problems. In the top one, a is the geometric mean as the height for both the smaller triangles inside the big one. Therefore,

The next one has the geometric mean of b, being a part of the smaller triangle on the left and the big triangle as a whole:

Left row 1. Supplementary 2.complementary 3 supplementary
Right row 1. Complementary 2 supplementary 3 supplementary