Question

please let me know if i'm correct :) i chose B

Find the lateral area of the square pyramid shown, to the nearest whole number.



A. 7294 yd2

B. 3192 yd2

C. 4758 yd2

D. 3647 yd2

Answer 1

B is incorrect, how did you get B?

Answer 2

perimeter*base/2

Answer 3

perimeter*height i mean , sorry

Answer 4

that's if you're dealing with a prism, not a pyramid

Answer 5

okay , so then what formula is correct for this problem?

Answer 6

if you draw in the slant height, you get what you see in blue

Answer 7

call that slant height s

so s = slant height

you can find the slant height if you look at the pyramid like this



this is what you would see if you look at the pyramid directly at once face (and not at the corner)...basically, you can only see one face

Answer 8

by the pythagorean theorem

a^2 + b^2 = c^2

21^2 + 38^2 = s^2

441 + 1444 = s^2

s^2 = 441 + 1444

s^2 = 1885

s = ???

Answer 9

im confused on how to get the s now would i divide?

Answer 10

you take the square root to undo the square

Answer 11

s = sqrt(1885)

s = ???

Answer 12

43.41?

Answer 13

so each triangular face looks like this