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PtichkaEL [24]
4 years ago
13

URGENT PLEASE HELP!!!!!!!!!!!! Quadrilateral ABCD ​ is inscribed in a circle.

Mathematics
2 answers:
sergij07 [2.7K]4 years ago
7 0
Opposite angles in a cyclic quadrilateral are equal to 180°.
Therefore,
(4x+5) + (x+15) = 180°
Collect like terms
4x+x+5+15 = 180°
5x+20 = 180
5x = 180-20
5x = 160
x = \frac{160}{5}
x = 32

A = 4x+5
A = 4(32)+5
= 128+5
= 133°
Stella [2.4K]4 years ago
4 0

I got 3.33 because I just set the problem up as

4x+5=x+15

and then I did

4x-x=3x

and then I did

15=3x+5

and then

15-5=10

and then

3x=10

then

10÷3=3.33

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