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In the diagram, AB=20cm,BC=21cm,AD=10cm and DE=10.5cm.Angle ABC and ADE are right angles.If triangle ADE is re?

what is the area of the shaded region remains? i write remains and also written below.

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what are you asking here, what does "If triangle ADE is re" mean? this may help you to draw the diagram and conceptualized the solution through your drawing
any info on line EC ... any chance you can be more precise as to what your question is?
                                                C
                                                 |
                                                 |
                                                 |
                                                 |
D_____10.5____________E         |
|                                                |
|                                              21
|                                                |
10                                              |
|                                                |
|                                                |
|                                                |
A________ 20 ________________B
 
Can we possibly get the points and shapes properly specified?
 
What is "triangle ADE is 're'"?
 

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