GEOMETRY. 20 POINTS. PLEASE DO NOT GIVE STUPID ANSWERS.

Mathematics

1 answer:

sp2606 [1]4 years ago

3 0

Hey there!

A quadrilateral has 360 degrees. So add all the degrees together to 360. 9x+1+5x-12+8x+61+90=360. 90 degrees is in the bottom left corner. Combine like terms. 22x+140=360. Subtract 140 from each side. 22x=220. Divide 22 on each side to get x=10. Plug in 10 for x in angle D. 5(10)-12=38. The measure of angle D is 38 degrees.

I hope this helps!

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In AABC, EF | AB. What is the ratio of BC to FC?

lara31 [8.8K]

Answer:

$\frac{\textbf{BC}}{\textbf{FC}}} = \frac{ \textbf{7 }}{\textbf{4}}$

Step-by-step explanation:

Given that EF ║ AB.

So, we have: $\frac{ \textbf{CE}} {\textbf{EA}} = \frac{ \textbf{CF}} {\textbf{FB}}$

Also, $\frac{ \textbf{AC}} {\textbf{CE}} = \frac{\textbf{CB}}{\textbf{CF}}$

Note that: AC = CE + EA = 3 + 4 = 7 and CE = 3

Therefore, $\frac{CB}{CF} = \frac{7}{4}$

Hence, the answer.

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3 years ago

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Olegator [25]

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