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bogdanovich [222]
3 years ago
11

What is the value of y? Enter your answer in the box. y =

Mathematics
2 answers:
Lorico [155]3 years ago
5 0

since this is an isosceles triangle

5x =40

divide by 5

x=8

the sum of all angles in a triangle is 180

5x+40 + 2y+20 = 180

substitute 40 in for 5x

40 + 40 + 2y+20 = 180

combine like terms

100 + 2y = 180

subtract 100 from each side

2y = 80

divide by 2

y= 40

masha68 [24]3 years ago
4 0

Y=40 because x=8 making the two bottom angles 40 each and leaving the last angle to be 100 and 100+40+40= 180. Hope this help

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