Mathematics
Calculate the area of the figure given below which is not drawn to scale.

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Answer
Area of figure ABCEF = Area of trapezium ABCF + Area of triangle CEF

Area of triangle CEF = x b x h = x CF x DE
= x 25 x 12 m2
= 25 x 6 m2
= 150 m2
In triangle BGC,
Base2 + Height2 = Hypotenuse2
⇒ CG2 + BG2 = CB2
Let h be the length of BG.
⇒ 102 + h2 = 262 (∵CG = CF - GF = CF - BA = 25 - 15 = 10)
⇒ 100 + h2 = 676
⇒ h2 = 676 - 100
⇒ h2 = 576
⇒ h =
⇒ h = 24 cm
Area of trapezium = (sum of parallel sides) x distance between the parallel sides
= (AB + CF) x BG
= (15 + 25) x 24 m2
= x 40 x 24 m2
= 20 x 24 m2
= 480 m2
So, total area of figure ABCEF = 150 + 480 m2
= 630 m2
Hence, the area is 630 m2.
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