Calculate 65154

Each square of the net has an area of 25 mm2. Calculate the area of the DEF triangle in cm2. Express the result as a decimal number to three decimal places.

Correct answer:

S =  4.375 cm2

Step-by-step explanation:

S1=25 mm  S1 = x2 x=S1=25=5 mm  a=7 x=7 5=35 mm v=5 x=5 5=25 mm  A=a cm=a:10  cm=35:10  cm=3.5 cm V=v cm=v:10  cm=25:10  cm=2.5 cm  S=2A V=227 25=835 cm2=4.375 cm2



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