Dear Student, Given: Side of square = 21 mArea= side2Area of square = 21×21 = 441 m2Side of square is diameter of the semi-circle, So, radius = 212 mArea of semi-circle = πr22There are a total of 4 semi-circles, so area = 4×πr22= 4×227×212×212×12= 11×3×21= 693 m2Total area of the given figure = 441+693 = 1134 m2Area each rose-plant needs = 6 m2Number of rose plants needed = 11346 = 189 rose plants Regards

pls solve Q20

Dear Student,

Given : Side of square = 21 m Area = {side}^{2} Area of square = 21 \times 21 = 441 m^{2} Side of square is diameter of the semi - circle, So, radius = \frac{21}{2} m Area of semi - circle = \frac{{πr}^{2}}{2} There are a total of 4 semi - circles, so area = 4 \times \frac{{πr}^{2}}{2} = 4 \times \frac{22}{7} \times \frac{21}{2} \times \frac{21}{2} \times \frac{1}{2} = 11 \times 3 \times 21 = 693 m^{2} Total area of the given figure = 441 + 693 = 1134 m^{2} Area each rose - plant needs = 6 m^{2} Number of rose plants needed = \frac{1134}{6} = 189 rose plants

Regards

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