Posted by Fustrated on Monday, February 6, 2012 at 9:37pm.
Look at one of the triangles, which is isosceles with a base of 8 and each of the equal sides of length 20
Height of triangle: let it be h
h^2 + 4^2 = 20^2
h^2 = 384
h = √384
Area of one triangle = (1/2)(8)(√384) = 4√384
Assuming the surface area consists only of the 4 triangles,
surface area = 4(4√384) or 16(8√6) = 128√6
Thanks, but I need the base too - that I can do by myself!
Related Questions
Geometry - The base of a regular pyramid is a hexagon whose sides have length 5 ...
geometry!! urgent (math) - The lateral edges of a regular hexagonal pyramid are ...
MATH! PLEASE REPLY ASAP! - OPQRS is a regular square-pyramid whose base has ...
math - Find the lateral area of a regular pyramid whose base is a square whose ...
geometry - How do you find the lateral area and perimeter of a pentagonal ...
math - Find the lateral area of a regular pyramid whose base is a square, whose ...
Geometry please help me need to finish! - The slant height of a regular ...
Geometry - 1 How many faces does a square pyramid have? 2 How many edges does a ...
Geometry - How do you calculate the lateral area and sueface area of a pyramid ...
geometry - Calculate the lateral area and surface area of a pyramid whose height...
For Further Reading
