# find the total surface area of a cube whose side is 20 cm

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**Given : **a Cube whose side is 20 cm.

**To Find **: total surface area of a Cube

**Solution:**

total surface area of a Cube = Sum of Surface area of each Face

A cube has all sides equal

Hence Surface area of one face = Side²

=> Surface area of one face = 20²

=> Surface area of one face = 400 cm²

A cube has 6 faces

Hence Total Surface Area = 6 x Surface area of one face

=> Total Surface Area = 6 x 400

=> Total Surface Area = 2400 cm²

**total surface area of a Cube whose side is 20 cm. is 2400 cm² **

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