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blagie [28]
3 years ago
7

Tanya has a triangular garden bed in her back yard. the measure of the largest angle is 30° less than twice the measure of the s

mallest, and the middle angle is 10°more than the measure of the smallest angle. find the measures of all 3 angles.
Mathematics
1 answer:
Zina [86]3 years ago
5 0
The properties of triangles says the total of all three angles will always be 180 degrees. We can use this property to help build our equation for the problem.
Let l be the largest angle, m be the middle, and s be the smallest.
We know from the question that l = 2s - 30 and that m = s + 10.
From the property above, we know l + m + s = 180.
We then know (2s - 30) + (s + 10) + s = 180. From this, we can solve for s, and then plug that value into the equations above for l and m to find them.
Expand the parenthesis and combine like terms.
4s - 20 = 180
Add 20 to each side.
4s  =  200
Divide both sides by 4.
s  =  50
So, our smallest angle is 50. Now recall the two equations for l and m above l = 2s - 30 and m = s + 10.
Plug in the value of s.
l = 2(50) - 30
Multiply 2(50).
l = 100 - 30
Subtract 30.
l = 70
The value of the largest angle is 70.
Plug in the value of s.
m = 50 + 10
Add 10.
m = 60
Finally, the middle angle is 60. So the answers are l = 70, m = 60, and s = 50.
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