9×10^2 + 5× 10^-2 + 4× 10-3 + 5× 10^ -4= write in usual form
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A circular park of radius 20m is situated in a colony. Three boys Ankur. Sved and
David are sitting at equal distance on its boundary each having a toy telephone in
his hands to talk each other. Find the length of the string of each phone
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