Answer:
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.
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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: