Using coordinates to compute Timelers and Area
[(0,6)
(a,0)
(-2, 0)
(0,0)
1(0, -b)
What is the perimeter of the polygon in the diagram?
OA
2V0-652
OB. 4(a+b)?
oc 2(a2+6²)
OD. 1/2012

Step-by-step explanation:

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AD || BC 
• AB = CD 
• ∠BAD = ∠CDA (a given condition ∵ ABCD is an isosceles trapezium) 

The diagonals AC and BD create two ∆'s: ∆ABD, and ∆ACD 

The two ∆'s are congruent (SAS).  
 
(S): AB = CD 
(A): ∠BAD = ∠CDA 
(S): AD = DA (common side) 

The corresponding sides of the two ∆'s, BD and AC, are also congruent. 
(the two diagonals of the trapezium/trapezoid)