find the area and perimeter of the unshaded part .
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Answer:
Perimeter of triangle = Sum of all sides
= 5.5+5.5+4 = 15cm
Area of any triangle by Heron's formula = Under root S (s-a)(s-b)(s-c) in which S = a+b+c/2
Now, S = 5.5+5.5+4/2 = 15/2 = 7.5cm
Under root 7.5 (7.5-5.5)(7.5-5.5)(7.5-4)
= Under root 7.5×2×2×3.5
= Under root 3×5×5×0.1×2×2×5×7×0.1
= Under root 3×5 square ×0.1 square ×2 square × 5×7
= 3×5×0.1×2×5×7
= 105.1 cm answer.
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