# GEOMETRY (SA oftriangular pyramid)

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Find the surface area of a triangular pyramid with b =4 cm, h= 8.2 cm and s = 7 cm. PLEASE. How ?

• GEOMETRY (SA oftriangular pyramid) -

Lateral surface area
=perimeter of base * apothem /2
=3b*s/2
(for a regular pyramid with a triangular base)

Area of triangular base with side b
=(√3)*b/2*(b/2)
=(√3)b²/4

• GEOMETRY (SA oftriangular pyramid) -

What is apothem ?

• GEOMETRY (SA oftriangular pyramid) -

why did you not include the height ?

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