You have to use
[tex]a ^{2} + b ^{2} = c ^{2} [/tex]
so take your 12in in height and use it as your
[tex]a^{2} [/tex]
divide 10 in half to make your base so now your
[tex]b^{2} [/tex]
is 5. now you have to add 12 and 5. this gives you 17. now square root it.
[tex] \sqrt{17} [/tex]
your answer in now. 4.12. since you have 2 triangles in one whole triangle add 4.12 to 4.12 and you get 8.24. your pyramid has 4 triangles so
[tex]4 \times 8.24[/tex]
is 32.98.
10×10 is 100 so add 32.98 to it.
your surface area is 132.98
