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

(49 points) Find the surface area to the nearest tenth. (Only round on the last step-example-1
User Rori
by
6.6k points

2 Answers

9 votes

Answer:

885.2

Explanation:

The other answer is almost correct they just rounded wrong.

I just did the test.

User Mike Furtak
by
6.8k points
1 vote

Answer:

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

User Jwerre
by
6.9k points
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