21" x 17" = 357 SQUARE INCHES To get cubic inches you would need a third measurement for the height. Then multiply that number by 357 to get cubic inches.
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To find the volume in cubic inches of a rectangular prism with dimensions 21 x 17, you would multiply the three dimensions (length, width, and height). Since a rectangular prism has three dimensions, you need a third dimension (height) to calculate the volume.
1 centimetre = 0.393700787 inches21 centimeters = 8.267716527 inches
21 centimeters is equal to 8.27 inches.
One inch is equal to 0.0254 metres. Therefore, 21 inches is equal to 0.0254 x 21 = 0.5334 metres.
21 inches = 533.4 millimeters.
There are 0.0000254 kilometres in one inch. Therefore, rounded to two decimal places, 21 kilometres is equal to 21/0.0000254 = 826771.65 inches.