Answer:
<em>Area of Shaded Region: 189 square centimeters</em>
Step-by-step explanation:
<em>~ To find the area of the shaded region, let us calculate the area of the rectangle added to the area of the two triangles, or the area of the whole triangle created from the two smaller triangles ~</em>
1. Given dimensions of 15 by 9 centimeters, the area of the rectangle would be ⇒ 15 cm * 9 cm = <em>135 cm^2</em>
2. It would be simpler if we were to consider the area of the larger triangle. The height in this case, by the Partition Postulate, would be 27 cm - 15 cm ⇒ 12 centimeters. Now provided that the shape with dimensions 15 cm by 9 cm is a rectangle, opposite sides are ≅, and thus ⇒ the base of this large triangle is 9 cm. That being said we can calculate the area of the triangle by ⇒ 1/2 * base * altitude ⇒ 1/2 * 9 cm * 12 cm ⇒ 6 cm * 9 cm ⇒ <em>54 cm^2</em>
3. The area of the shaded region is thus 135 cm^2 + 54 cm^2 ⇒ <em>189 cm^2</em>
<em>Area of Shaded Region: 189 square centimeters</em>
