If your height is 90 cm, then you're said to be 90 cm tall.
If you don't have a feeling for lengths expressed in metric units, you get someone
to convert that length into English units for you. When he does that, you realize
that you must have quoted the metric height incorrectly, because 90 cm is about
a half-inch less than 3 feet.
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If Mr. Usher is 190 cm tall, Sarah would be 10% shorter, which means she would be 90% of his height. To find Sarah's height, you would multiply Mr. Usher's height by 0.90 (90%). Therefore, Sarah would be 190 cm x 0.90 = 171 cm tall.
90 cm is 9 decimeters.
The circumference of a 90 cm circle is: 283 cm
6 cm tall
8100cm