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3 years ago

21. Chandra is retiling her bathroom floor. Each tile is in the shape of a

Mathematics

1 answer:

evablogger [386]3 years ago

6 0

Answer:

42.25 square inches

Step-by-step explanation:

the formula for area of a square is length x width

a square has four equal sides

so the length and width of the square are 6.5

so you would multiply 6.5 by itself: 6.5x6.5=42.25

so the tile overs 42.25 sq inch

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Answer:

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Step-by-step explanation:

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Simply plug in our coordinates to find slope:

m = (11 - 2)/(5 - 8)

m = 9/-3

m = -3

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3 years ago

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Answer:

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2 years ago

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Answer:

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Step-by-step explanation:

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2 years ago

Using the Law of Cosines, in triangle DEF, if e=18yd, d=10yd, f=22yd, find measurement of angle D

Ivahew [28]

Check the picture below.

$\bf \textit{Law of Cosines}\\ \quad \\
c^2 = {{ a}}^2+{{ b}}^2-(2{{ a}}{{ b}})cos(C)\implies 
c = \sqrt{{{ a}}^2+{{ b}}^2-(2{{ a}}{{ b}})cos(C)}
\\\\\\
\cfrac{{{ a}}^2+{{ b}}^2-c^2}{2{{ a}}{{ b}}}=cos(C)\implies cos^{-1}\left(\cfrac{{{ a}}^2+{{ b}}^2-c^2}{2{{ a}}{{ b}}}\right)=\measuredangle C\\\\
-------------------------------\\\\
\begin{cases}
d=10\\
e=18\\
f=22
\end{cases}\implies cos^{-1}\left(\cfrac{{{ 18}}^2+{{ 22}}^2-10^2}{2(18)(22)}\right)=\measuredangle D$

$\bf \implies cos^{-1}\left(0.893\overline{93}\right)=\measuredangle D\implies 26.63^o\approx \measuredangle D$

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3 years ago