Isosceles trapezoid

Calculate the area of an isosceles trapezoid whose bases are in the ratio of 4:3; leg b = 13 cm and height = 12 cm.

Correct answer:

S =  420 cm2

Step-by-step explanation:

b=13 cm h=12 cm  S = 2a+c h  a12 = b2  h2 a1=b2h2=132122=5 cm  a = c+2a1 a/c = 4:3 = 4/3 (c+2a1)c = 4/3 3(c+2a1) = 4c 6a1 = c  c=6 a1=6 5=30 cm a=c+2 a1=30+2 5=40 cm  S=2a+c h=240+30 12=420 cm2



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Tips for related online calculators
Check out our ratio calculator.
See also our right triangle calculator.
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Calculation of an isosceles triangle.
See also our trigonometric triangle calculator.

 
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