What is the total combined area

Total area is all area of a 2D shape or 3D shape combined.

You need to write out a formula for each shape.

Shape 1 ) A = L x H  for any 4 sided 2D shapes

Shape 2) For irregular 4 sided 2D shapes you need to draw a line to create 2 triangles

L x L x L  +   L x L x L  = A

Shape 3) For Trapezoid

Surface area can be given with this formula: Surface Area of Trapezoidal Prism = (b1+b2)h + PH. In this formula, b1 and b2 stand for the length of the bases of the trapezoid. Lower case h is the height of the trapezoid. Upper case P is the perimeter of the trapezoid, and upper case H is the height of the prism

Shape 4 cuboid or prism

You take the surface area x (above)

so that;

A + A of each face = Total combined Area.

Except for Rectangular prism where we first find the longer L x H = A

Then;  A + A of each face if 3 different sizes faces would be A x 2  A x 2 A x 2. if 2 different sizes would be A x 2 A x 4 so that prism with 6 sides would equal 6

Some prism have 5 sides like a triangular prism

A x 2  A x 3

We would do the rectangles first to remind us the process of Volume for other questions.

For circles we use A = π × r2

For cylinders we use A of the circle (just mentioned) so that A+ A are the circular areas then work out the area of the Side and add them using the formula  2πr2 + 2πrh.

Formula for sphere =A=4πr2

Step-by-step explanation: