Question

I don’t know what the answer is

Answer 1

9. Answer: 176 m²

Step-by-step explanation:

$Area_{\ \text{shaded region}}=Area_{\ \text{rectangle}}-4\cdot Area_{\ \text{corner triangles}}\\.\qquad \qquad \qquad \quad =(4+18+4)(8)-4\bigg(\dfrac{1}{2}\cdot 4\cdot 4\bigg)\\\\.\qquad \qquad \qquad \quad =\qquad (26)(8)\quad -\qquad 4(8)\\\\.\qquad \qquad \qquad \quad =\qquad \quad 208\quad -\qquad \quad 32\\\\.\qquad \qquad \qquad \quad =\qquad \qquad \quad 176$

10. Answer: 224 cm²

Step-by-step explanation:

Divide the shape into rectangles and and one triangle (see attachment).

Then find the Area for each of the segments.  

Their sum is the Area of the shape.  A = 10 + 55 + 105 + 54

                                                                = 224

Answer 2

Find the area of the larger rectangle around the shaded shape and subtract the 4 you congruent triangles from it.

8x18 - [4(1/2 x 4 x 4)
144 - 4(8)
144-32
112 sq. m