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area of a triangle = 0.5 * base * height.

Hence, the base of the triangle

= 2 * area / height

= 2 * 90 [in2] / 12 [m]

we know 1 [m] = 39.37 [in]

or equivalently, 1 = 39.37 [in/m]

Therefore, base

= 2 * 90 [in2] / (12 [m] * 1)

= 2 * 90 [in2] / (12 [m] * 39.37 [in/m] )

= 2 * 90 [in] / (12 * 39.37 )

= 0.381 [in]

===============

area=basexheight/2 bring two over to ninety side 90x2=180 180=12xbase 180/12=15 base=15 =============== The second author above has forgotten about the units -- the area given is in square inches and the height is in meters.

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