UNIT 1.3 SURFACE AREAS OF 3DOBJECTS
© Copyright all rights reserved to Homework depot: www.BCMath.ca
I) REVIEW: RECTANGULAR PRISMS
Prisms are 3D objects where two opposite sides areparallel and have the same shape
A rectangular Prism is a prism where the opposite endsare rectangles/squares
© Copyright all rights reserved to Homework depot: www.BCMath.ca
Triangular Prism
Pentagonal Prism
Hexagonal Prism
II) AREAS OF RECTANGULAR PRISMS
A rectangular prism has six sides
Opposite sides have equal areas
To find the surface area of the prism, find the sum ofthe top, front, and right sides, then multiply by two!
© Copyright all rights reserved to Homework depot: www.BCMath.ca
Front
Back
Top
Bottom
Left
Right
Surface Area:
III) COMPOSITE SHAPES
A composite shape is a combination of two or moresolids combined together
© Copyright all rights reserved to Homework depot: www.BCMath.ca
Each solid has six sides. To find the surface area, findthe area of all six sides
Right
Left
Front
Top
Back
Bottom
PRACTICE: DRAW ALL SIX VIEWS AND FIND THE SURFACEAREA
Front
Back
Right
Left
Top
Bottom
Surface Area
© Copyright all rights reserved to Homework depot: www.BCMath.ca
PRACTICE: FIND THE SURFACE AREA OF EACH SOLID:
Front
Back
Left
Right
Top
Bottom
Surface Area
Front
Back
Left
Right
Top
Bottom
Surface Area
However, thearea should be
30 units2 not28 units2
This is because
two sides aremissed whentaking all sixviews
Another method for finding thesurface area is to count the totalnumber of blocks.
Then subtract the number of sidesthat are covered from twoconnecting blocks
There are 7 blocks in total
There are 12 sides covered
Surface Area
