Answer:

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Given: In square JUMP,

diagonal is 4.2 cm ie. JM = UP = 4.2cm

PROCEDURE :

Step 1 : draw a rough sketch of square JUMP and mark th given measurements.

The diagonals of a rhombus bisect each other perpendicularly.

JM and UP are diagonals of the square JUMP which bisect each other at ‘B ie. ∠ JBU = 90° and UB = BP = UP/2 = 4.2/2

= 2.1 cm