A.
let the number be n.
2n+5=45
2n=40
n=20
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Find area of the border :
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Area of the room = 22 x 25 = 550 ft²
Area of the rug = 238 ft²
Area of the border = 550 - 238 = 312 ft²
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Define y:
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Let the width be y.
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Find area of the border in term of y :
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The area of the border = 22y x 2 + 25y x 2 - 4y² = 94y - 4y²
*We need to take away 4y² because the 4 corners will be overlap twice if we don't.
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Solve y :
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94y - 4y² = 312
4y² - 94y + 312 = 0
2y² - 47y + 156 = 0
<span>(y - 4)(2y - 39) = 0
</span>y = 4 or y = 19.5
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Answer: The border can be 4 ft or 19.5 ft
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We know that
circumference=2*pi*r
for r=7 in
circumference=2*pi*7------> 14*pi in
if 360° (full circle) has a length of------------ 14*pi in
135°-----------------------------> x
x=135*14*pi/360----------> x=5.25*pi in--------> 16.49 in
the answer is
5.25*pi in or 16.49 in
Answer:
78.5
Step-by-step explanation:
C= 2 pi r or C= d pi
25(3.14)=78.5
