Question

(49 points)
Find the surface area to the nearest tenth. (Only round on the last step)

Answer 1

885.2

Explanation:

The other answer is almost correct they just rounded wrong.

I just did the test.

Answer 2

885.18

Explanation:

Base = 18x18=324

triangles = 1/2(18)height

To find the height, you could divide it in half and use the 30-60-90 rule or Pythagorean theorem.

9²+b²=18²

81+b²=324

b²=324-81

b²=243

b=√243

b=15.58

So each triangle is 1/2(18)(15.58845)=140.2961.

Four of them would be 561.1845.

Now add the base.

561.1845+324=885.1844