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3 February, 03:12

The surface area of a rectangular prism is 150 cm². If all the sides are tripled, what will the new surface area be?

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  1. 3 February, 06:37
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    SA=2 (LW+LH+WH)

    if all are trippled then

    SA=2 (3L3W+3L3H+3W3H)

    SA=2 (9LW+9LH+9WH)

    SA=2 (9) (LW+WH+WH)

    SA=9 (2 (LW+WH+WH))

    the SA will be multiplied by 9

    150 times 9=1350

    new surface area is$1350 cm²
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