<u>Part 1</u>
Using the distance formula,

So, the measure of the longest side is 6 units.
<u>Part 2</u>
Triangle ABD will have vertices A(1,7), B(-2, 2), and D(1,2).
We already know that 
Using the distance formula,

So, ABD is a scalene triangle.
<u>Part 3</u>
From part 2, we know that the length of side AD is 5 units.
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Answer: 10 × 6 is the answer 10 times 6= 60 not 106
Answer:
Step-by-step explanation:
I am pretty sure your answer is 3
Answer:
r²+6r+9
Step-by-step explanation:
for the expansion of (r+3)², we use the formula as,
(a+b)²=a²+2ab+b²
here, we have
a=r
b=3
plug in all the values
(r+3)²=r²+2(r)(3)+3²
solving the equation
(r+3)²=r²+6r+9