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82.56 cm squared

Step-by-step explanation:

12.9-8.6

4.3

4.3*6.4

27.52- area of the triangle on the left of the figure.

Then figure out the rectangle that completes the figure.

8.6*6.4

55.04

Add the two values to complete the figure:

55.04+27.52

82.56 cm squared should be correct.

Have an amazing day!!!

-Gumina

82.56 cm squared

Step-by-step explanation:

It is better to use completing the square method to solve this quadratic equation.