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If they are identical triangle, and they share the same overlapped unshaded area, that means the shaded portion of each triangle is equal.

Each shaded portion of one triangle is 96/2= 48cmsq

Area of one triangle= 1/2 * 10 *15= 75 cmsq

Therefore unshaded region = 75 – 48= 27 cmsq.

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As the right-angled triangles are identical,, area of unshaded part ——- [(1/2) x 15 x 10 x 2 – 96]/2 = 27

Ans : 27 sq cm

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