Surface area is area of all the surfaces added together.
There are 5 surfaces ----- 3 rectangles and 2 triangles.
The formula for area of rectangle is
Area = length * width
The formula for area of triangle is
Area = 1/2 * base * height
Now, lets find all the 5 surface areas. Shown below:
1. Left Rectangle Area = 4 * 6 = 24
2. Middle Rectangle Area = 5 * 6 = 30
3. Right rectangle area = 3 * 6 = 18
4. Top Triangle Area = 1/2 * 3 * 4 = 6
5. Bottom triangle area = 1/2 * 3 * 4 = 6
Total Surface Area = 24 + 30 + 18 + 6 + 6 = 84 square centimeters
