Posted by Lloini on Sunday, July 14, 2013 at 7:32am.
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)  MathMate, Sunday, July 14, 2013 at 8:41am
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)  Anonymous, Sunday, July 14, 2013 at 10:05am
What is apothem ?

GEOMETRY (SA oftriangular pyramid)  Anonymous, Sunday, July 14, 2013 at 10:15am
why did you not include the height ?
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