Answer:
C. c^2=a^2+b^2-2abcos(90°)
Step-by-step explanation:
This is the law of cosine.
Both triangles area:
4.2 x 8.2 = 34.44
you don’t need to divide by two cause there’s two triangles anyways.
also, you get 8.2 by subtracting the total length by the top length. (13.5-5.3)
rectangle:
4.2 x 5.3 = 22.26
the total area is 56.7cm squared
Answer:
10,000,000
Step-by-step explanation:
you round up, so that makes it 10,000,000
Answer:

Step-by-step explanation:
This is the answer because it is subtracted so that you get the answer