Wednesday

April 23, 2014

April 23, 2014

Posted by **Joe** on Saturday, February 11, 2012 at 2:27am.

- Mathematics -
**Anonymous**, Saturday, February 11, 2012 at 4:31amsqrt ( 15 ^ 2 - 12 ^ 2 ) = sqrt ( 225 -144 ) = sqrt ( 81 ) = 9 cm

- Mathematics -
**Reiny**, Saturday, February 11, 2012 at 8:34amDraw one of the side triangles, and consider its altitude from the base of 12, call that x

x^2 + 6^2 = 15^2

x^2 = 19

x =√189

so the surface area = the base + 4triangles

= 144 + 4(1/2)(12)(√189) = ....

for the volume , we need the height of the pyramid,

call it h

h^2 + 6^2 = (√189)^2

h^2 = 153

h = √153

volume = (1/3)(base)(height)

= (1/3)(144)(√153

= 48√153

**Related Questions**

Maths - OPQRS is a right pyramid whose base is a square of sides 12cm each. ...

Maths - OPQRS is a right pyramid whose base is a square of sides 12cm each. ...

MATH! PLEASE REPLY ASAP! - OPQRS is a regular square-pyramid whose base has ...

mathematics - The base of a pyramid is a regular hexagon consisting of six ...

Areas and volumes - A regular pyramid is inscribed in a right circular cylinder...

math - looking at a square pyramid, if the size of the base remains the same and...

GEOMETRY - FIND THE LATERAL AREA OF A RIGHT PYRAMID WHOSE SLANT HEIGHT IS 18mm ...

Geometry - Determine the slant height of a right pyramid whose lateral area is ...

geometry - Determine the slant height of a right pyramid whose lateral area is ...

math - the altitude of the pyramid is 30cm and its base is enclosed by a ...