Question

Find the area of shaded portion
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Answer 1

Answer:

139cm2

Step-by-step explanation:

find the area of outer part 21X21

then substraction of outer area by inner area

Answer 2

Answer:

94.5 cm²

Step-by-step explanation:

Area of the whole square is 21×21 cm²=441 cm²

there are 4 parts of circle and if we shall combine them they will make a square because each part of square is of 90° (4×90°=360° which is equals to a circle)

and the radius of this circle will be 21÷2 cm

so the area of the circle which is equals to the total of the four parts of circle is π×(21÷2)² cm² =(22÷7)×(21÷2)² cm² =346.5 cm²

So the total area of the shaded portion is equals to (the area of the square) - (the square of the circle) =441 cm² - 346.5 cm² = 94.5 cm²

so the answer is 94.5 cm².

this method is correct but please check my calculations...

and I have wasted a lot of time for you so please mark me as brianlist....