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Step-by-step explanation:

The height of the triangle is important to find the area of the rectangle.

We can split the triangle in half, we get a right triangle.

Apply Pythagorean theorem to solve for the height.

3² + b² = 6²

b² = 6² - 3²

b² = 36 - 9

b² = 27

The length of the rectangle is 3 + 3 + 3 + 3  =  12 mm

The width is 3 + + 3  = mm

The area of a rectangle is length × width.

Distribute.

The area of the rectangle is mm².

x

step-by-step explanation:

5x+10 is the correct one

hope this