median
don steward
mathematics teaching 10 ~ 16

Thursday, 27 October 2011

grate question

fire grates come in sizes that are the arc length of the front edge










a manufacturer provides these dimensions for a '16 inch' grate













assume that the centre of the arc is at the back edge of the grate

calculate the length of the front arc in mm

convert to inches using 25.4 mm = 1 inch

is the arc length close to 16" ?






the dimensions for other grate sizes are:
12" = 280mm, 220mm, 170mm
14" = 330mm, 240mm, 210mm
what are the arc lengths of these grates?

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