Trapezoid 18313

Find the points A1 B1 symmetric along the y-axis to the points A [-4,0] and B [-1,4]. Calculate the perimeter of the trapezoid AB B1 A1.

Correct answer:

S =  20

Step-by-step explanation:

A=(4,0) B=(1,4) A1=(Ax,Ay)=(4,0) B1=(Bx,By)=(1,4)  a = A A1 c = B B1  a=2 Ax=2 (4)=8 c=2 Bx=2 (1)=2 h=AyBy=04=4  S=2a+c h=28+2 4=20



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