Question

9 th and 10th one ..plz...I'll mark u as brainliest

Answer 1

your answer are here

Answer 2

Step-by-step explanation:

(9)

Given, Diameter = 35 cm.

Then, radius = 35/2 = 17.5 cm.

(i) Area of rectangular park = length * breadth

                                            = (40 * 35)

                                            = 1400 m².

(ii) Area of two-semicircular parts = 2 * πr²/2

                                                       = πr²

                                                       = (22/7) * (17.5)²

                                                       = 962.5 m².

∴ Area of the park = 1400 + 962.5 = 2362.5 m²

(iii) Circumference of semi-circle = πr

                                                      = (22/7) * 17.5

                                                      = 55 m.

∴ Perimeter of the park = 2(40 + 55)

                                       = 190m

Therefore:

⇒ Area of the park = 2362.5 m²

⇒ Perimeter of the park = 190 m.

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(10)

Given side = 28 cm.

Perimeter of semi-circle:

= πd/2 + 3(28)

= (22/7) * (28/2) + 3(28)

= 44 + 84

= 128 cm.

Area of shaded region:

= (√3/4)a² + πr²/2

= (√3/4)(28)² + (22/7) * 98

= 196√3 + 308 cm.

Therefore:

⇒ Perimeter = 128 cm.

⇒ Area of the shaded region = 196√3 + 308

Hope it helps!