Calculate 2556

Calculate the arm size b of the trapezoid ABCD if a = 12 cm, c = 4 cm, d (AC) = d (BC) and the area S (triangle ABC) = 9 cm square.

Correct answer:

b =  6.1847 cm

Step-by-step explanation:

S=9 cm2 S=av/2 v=2S/a=29/12=1.5 cm b2=v2+(a/2)2 b=1.52+62=6.1847 cm

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