To find the area that needs to be frosted, we first need to find the surface area of the top and the sides of the cake.
Surface area of the top of the cake:
Area = πr^2
Area = 3.14 * (10/2)^2
Area = 3.14 * 5^2
Area = 3.14 * 25
Area = 78.5 cm^2
Surface area of the sides of the cake:
Circumference = 2πr
Circumference = 2 * 3.14 * 5
Circumference = 31.4 cm
Height of the cake = 2 cm
Area of the sides of the cake = Circumference * height
Area = 31.4 * 2
Area = 62.8 cm^2
Total area to be frosted = Area of top + Area of sides
Total area = 78.5 + 62.8
Total area = 141.3 cm^2
Therefore, Jared will need 141.3 cm^2 of frosting to frost the top and sides of the cake.
Jared baked a cake for his sister's birthday and is trying to figure out how much frosting he will need to decorate it. The cake has a diameter of and a height of .8 cm
If he only wants to frost the top and the sides of the cake, how much frosting will he need? Use .3.14
Area to be frosted
1 answer