About 26.38.
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18 inches = 45.72 centimetres.18 inches = 45.72 centimetres.18 inches = 45.72 centimetres.18 inches = 45.72 centimetres.
There are 12 inches per foot. Sixty-seven inches is 5 feet and 7 inches.
70 inches = 177.8 centimetres.70 inches = 177.8 centimetres.70 inches = 177.8 centimetres.70 inches = 177.8 centimetres.
Let's start by measuring everything in the same units, rather than some in inches and some in feet. (five feet + four inches) x (five feet) = (sixty-four inches) x (sixty inches) Now one inch is equal to 2.54 centimetres (this is one of those handy facts that's good to memorise), which means that (sixty-four inches) = (sixty-four) * (2.54cm) and (sixty inches) = (sixty inches) * (2.54cm) Further, a centimetre is 1/100 of a metre, so we write this as (sixty-four inches) = (sixty-four) * (2.54cm) = (sixty-four) * (2.54) * (1/100 metre) and (sixty inches) = (sixty inches) * (2.54cm) = (sixty) * (2.54) * (1/100 metre) So let's plug these two into our original equation, getting (five feet + four inches) x (five feet) = (sixty-four inches) x (sixty inches) = (sixty-four) * (2.54) * (1/100 metre) * (sixty) * (2.54) * (1/100 metre). All we have to do now is multiply, which gives us about 2.477 * (metre) * (metre) - a bit under two and a half square metres.
90 centimetres = 35.43 inches