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27 votes
27 votes
PLEASE HELP! I tried adding, using square roots, multiplying but still have not got the correct answer. Not sure how I can solve this problem or where to start.

PLEASE HELP! I tried adding, using square roots, multiplying but still have not got-example-1
User Pbarney
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1 Answer

14 votes
14 votes

9514 1404 393

Answer:

38.63 m

Explanation:

The definition of the perimeter tells you that you need to find the lengths of each of the edges of the figure.

The diagonal edge at left is the hypotenuse of a right triangle with legs 4 and 6. They Pythagorean theorem tells you that length is ...

d = √(4² +6²) = √52 ≈ 7.21 . . . meters

The straight line across the top is marked 9 meters.

The semicircle length is half the circumference of a circle with diameter 6 m. That semicircle length is ...

semicircle length = (1/2)πd = (1/2)(3.14)(6 m) = 9.42 m

The straight bottom edge of the figure is 4+9 = 13 m.

Then the sum of lengths around the figure is ...

7.21 m + 9 m + 9.42 m + 13 m = 38.63 m

The perimeter of the figure rounded to 2 decimal places is 38.63 meters.

User Preets
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2.9k points