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GuDViN [60]
3 years ago
9

I need help with 6a and b...I don’t understand how to solve for x

Mathematics
1 answer:
ELEN [110]3 years ago
4 0
In a

let's say the unmentioned angle is Y

so a line is 180° thus Y+145°=180°

we can get y=35°

so a triangle has inside angle sum of 180 and this gives us

X-25°+X+35°=180°

2X=170°

X=85°

for b

we know the inner angles of any four sided figure is 360°

X-35°+2X-75°+X+X=360°

5X=450°

thus X=90°
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