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daniel1480
21.07.2019 •
Mathematics
The length and width of the screen of the tv set are in the ratio 16: 9. if the perimeter of the screen is 180cm find its length and width
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Ответ:
x> the length of the screen of the TV
y> the width of the screen of the TV
we know that
perimeter of the screen=2*[x+y]
perimeter=180 cm
180=2*[x+y]> 90=x+y> equation 1
x/y=16/9>x=(16/9)*y> equation 2
substitute the equation 2 in equation 1
90=[(16/9)*y]+y> (25/9)*y=90> y=32.4 cm
x=(16/9)*32.4> x=57.6
the answer is
the length of the screen of the TV is 57.6 cm
the width of the screen of the TV is 32.4 cm
Ответ:
9514 1404 393
12°
Step-by-step explanation:
We assume you mean ...
∠x = 174°
Angle a is supplementary to angle x, so is ...
∠a = 180° -174° = 6°
Angle b is a vertical angle with respect to angle 'a', so is the same measure.
∠a +∠b = 6° +6° = 12°