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Question:
Find the perimeter of the following shape, rounded to the nearest tenth: Shape ABCD is shown. Point A is at negative 3, 5. Point B is at 1, 7. Point C is at 3, 3. Point D is at negative 1, 1.9.8
16
17.9
24
Answer:
You the points A(-3, 5), B(1, 7), C(3, 3) and D(-1, 1).
You use the formula: AB= 
AB =
DC =
BC =
AD =
AB=DC and AD=BC => the shape is a parallelogram(1)
But AB=DC=AD=BC + (1) => the shape is a square
Perimeter for a square = 4*l =4*
= 4.472135
P=4*4.472135=17.8854 which is rounded to 17.9
The right answer is C. 17.9
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