CK12 - Geometry

squareunits

Example 9

Use a net to find the surfacearea of the prism.

The area of the net is equalto the surfacearea of the figure.To find the area of the triangle,we use the
formula:

A= 1/2hbwherehis the heightof the triangleandbis its base.

Notethat trianglesAandEare congruentso we can multiplythe area of triangleAby 2.

Thus,the surfacearea is 324 squareunits.

SurfaceAreaof a PrismUsingPerimeter

This hexagonalprismhas two regularhexagonsfor basesand six sides.Sinceall sidesof the hexagonare
congruent,all of the rectanglesthat makeup the lateralsidesof the three-dimensionalfigureare also con-
gruent.You can breakdownthe figurelike this.