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Lynna [10]
3 years ago
12

Rounded to the nearest tenth, what is the perimeter of rectangle ABCD?

Mathematics
1 answer:
kvv77 [185]3 years ago
7 0
  • <em>Answer:</em>

<em>54.6 cm</em>

  • <em>Step-by-step explanation:</em>

<em>Hi there ! </em>

<em>T30° => AD = AC/2 = 20cm/2 = 10 cm</em>

<em>T.Phytagoras</em>

<em>CD = √AC² - AD² </em>

<em>= √20² - 10²</em>

<em>= √400-100</em>

<em>= √300</em>

<em>= 10√3</em>

<em>= 10×1.73</em>

<em>= 17.3 cm</em>

<em>P = 2AD + 2CD</em>

<em>= 2×10cm + 2×17.3cm</em>

<em>= 20cm + 34.6cm</em>

<em>= 54.6 cm</em>

<em>Good luck ! </em>

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We can use the factored form of a Quadratic to find an equation with 8 and -8 as our solution.

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