Question

want you to build me a pyramid out of plywood. the side of the pyramid will be EQUILATERAL TRAINGLES with sides measuring 8ft. what is the LATERAL AREA of the pyramid? round to the nearest ft. PLEASE HELP ME, LAST QUESTION FOR A SUNDAY NIGHT HW

Answer 1

Find the area of an equilateral triangle with side eight, and multiply by four.

Answer 2

i did already but my answer is not on the multiple question :(

Answer 3

im homeschooled so i have no teacher to teach me this

Answer 4

Well, the area of a triangle is \[A=\frac{bh}{2}\]An equilateral triangle has a height about sqrt 3/2 times the side of the base (this can be found by using the Pythagorean Theorem), so the formula will give us\[A=\frac{bh}{2}=\frac{8(\frac{8\sqrt3}{2})}{2}=32\sqrt3\]Since there are four such sides, multiply by four to get 128 sqrt 3, approx 221.7 ft^2.