book Maths Puzzle Numerical Ability

A rectangle has a length of 8 cm and a diagonal of 10cm. find the rectangles width, perimeter, area?

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Do I use the pythagorean theorem?? Two planes simultaneously from the airport one flying north and the other east. The northbound plane is fly ms. lynch has 21 coins in nickle and dimes.Their total value is $1.65.How many of each coin does she have