Serious only. (use special right triangles to determine the surface area of a regular pyramid - geometry).

what is the surface area of this square pyramid?
round your answer to the nearest tenth.

122.2 yd²

192.8 yd²

244.4 yd²

513.3 yd²

note: image not drawn to scale.

Option B

Step-by-step explanation:

a=side of square=8.4

h = height of the triangle =

Each triangle on 4 sides would be equilateral because one angle is 60 and isosceles.

Side of triangle s = 8.4

base area =

Area of each equilateral triangle =

Hence surface area = base area +4(area of each triangle)

square yards

Hence option B is right answer

answer: options

step-by-step explanation:

0.02

step-by-step explanation:

time of 9 192 631 770 periods of the radiation corresponding to the transition between the 2 hyperfine levels of the ground state of the caesium 133 atom at 0 k (but other seconds are sometimes used in astronomy)