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Use Pythagoras' theorem:

82+52 = 89 and the square root of this is 9.433981132 cm

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Q: What will be the measure of the diagonal of the rectangle if the sides are 8cm and 5cm?
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What is the area of a rectangle with sides 5cm 5cm 10cm 10cm?

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Use Pythagoras's theorem -- c2=a2+b2, where a and b are sides of a rectangle, and c is the diagonal. Here, a = 5 [cm] and b = 10 [cm] So, c = sqrt (52 + 102) = 11.18 [cm] (<-- the negative root can be ignored) ===========================================


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What is the perimeter of a shape?

The perimeter is the total distance around the outside of a 2D shape. You calculate it by adding all the lengths of the sides together.So, for example.If I had a rectangle, the length was 11cm, and the width was 5cm.To work out the perimeter of this rectangle, I would simply add all the sides together. So, 11cm+11cm+5cm+5cm=33cmSimple! Hope I helped!