Surface Area 7th grade

Surface area is the total area that the surface of a three-dimensional object occupies.

The surface area of a cube is calculated using the formula: 6a², where 'a' is the length of one side.

The surface area of a rectangular prism is calculated using the formula: 2(lw + lh + wh), where l is length, w is width, and h is height.

The diameter is twice the radius. Formula: d = 2r.

To find the radius, divide the diameter by 2. Formula: r = d/2.

The surface area of a cylinder is calculated using the formula: 2πr(h + r), where r is the radius and h is the height.

Similar figures are shapes that have the same shape but different sizes; their corresponding angles are equal and their sides are proportional.

The surface area of a sphere is calculated using the formula: 4πr², where r is the radius.

The area of a circle is calculated using the formula: A = πr², where r is the radius.

Use the ratio of the corresponding sides of the similar figures to set up a proportion and solve for the missing side.