Finding surface area of a rectangle or square
To find the area of a rectangle or square just take the length x the height of the shape.
Finding the surface area of a triangle
To find the area of a triangle, just take length x height and then divide it by 2. Finding the surface area of a trapezoid
To find the area of a trapezoid, find the area of the inner rectangle, and the two outside triangles, then add them together. You can find surface area of 3d shapes by finding the area of all of the shapes that make it up after you make a net, then just add them together.
Cylinder Formula: 2 π r2 + 2 π r x h
Cone Formula: π r2 + π r s
Sphere
4 piR squared
Square Pyramid
2 x Base x Slant Height + base squared
Rectangular Prism
2 x base x height + 2 x height(width) + 2 x base x width
To find the area of a rectangle or square just take the length x the height of the shape.
Finding the surface area of a triangle
To find the area of a triangle, just take length x height and then divide it by 2.
Finding the surface area of a trapezoid
To find the area of a trapezoid, find the area of the inner rectangle, and the two outside triangles, then add them together.
You can find surface area of 3d shapes by finding the area of all of the shapes that make it up after you make a net, then just add them together.
Cylinder
Cone
Sphere
4 piR squared
Square Pyramid
2 x Base x Slant Height + base squared
Rectangular Prism
2 x base x height + 2 x height(width) + 2 x base x width