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Question

The polygon ABCDE is divided into parts as shown in fig., find it area, if AD=9 cm, AH=8 cm, AF=3 cm, AG=6 cm and perpendicular BF=2 cm, CH=2.5 cm, FG=3 cm.
1152586_9642575fe98646e19905ca9abb0368a8.png

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Solution

Considering EG=3cm instead of FG=3cm

Area of polygon ABCDF = Area of AFB + Area of trapezium FBCH+Area of CHD+Area of ADE

=12×AF×BF+FH×(BF+CH2)+12×HD×CH+12×AD×GE

=12×3×2+5×(2+2.52)+12×1×2.5+12×9×3

=3+5.625+1.25+13.5

=23.375cm2

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