IS this correct. Im not so sure, especailly about c. Thanks.

A pyramid has a square base of side 10. A lateral edge of the pyramid is 13.

a) Find the slant height.

12, because of specail right triangle 5,12,13

b)Find the total area.

LA= 1/2pl

LA= 1/2 40x12

LA=240

TA=LA+B

TA=240+100

TA= 340units^3

c) Find the volume.

V=1/3Bh

V=1/3x100xh

(height h=2leg30 (12=slant edge)

12=2leg30

6=leg30

6=apothem

6^2+hieght^2=12^2

36+ h^2=144

h^2=108

h=6squarerootof3)

V=1/3x100x6(sr3) (sr= square root)

V=100/3 x 6(sr3)