Katy wants to wrap a present that is 15cm wide, 18cm deep and 4cm high. How much wrapping paper will she need to use?
2(15*18 + 15*4 + 18*4) cm^2
To calculate the amount of wrapping paper Katy will need, we need to find the surface area of the present, which is the total area that needs to be covered.
To calculate the surface area, we can use the formula for a rectangular prism:
Surface Area = 2 * (width * depth + depth * height + height * width)
Let's substitute the given measurements into the formula:
Width = 15cm
Depth = 18cm
Height = 4cm
Surface Area = 2 * (15cm * 18cm + 18cm * 4cm + 4cm * 15cm)
Simplifying the equation:
Surface Area = 2 * (270cm² + 72cm² + 60cm²)
Surface Area = 2 * 402cm²
Surface Area = 804cm²
Therefore, Katy will need 804 square centimeters of wrapping paper to cover the present.