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3 years ago

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

Mathematics

1 answer:

sp2606 [1]3 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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Step-by-step explanation:

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Step-by-step explanation:

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