Question

the radius of a semicircle plot is 21 metre find its area and perimeter​

Answer 1

Answer:Given radius of semi -circular plot is r=21 mas we know thatPerimeter of semi circle with radius r is πr and area of semi circle is 4πr 2 So perimeter of semi-circular plot is π(21)= 722 ×21=66 mArea of semi-circular plot is 4π(21) 2 = 7×422×21×21 =346.5 m Step-by-step explanation:Hope it will help you

Answer 2

Given :-

• Radius of a semi-circular plot is 21m

To Find :-

• Area and perimeter of that plot

Solution :-

~Here, we're given the radius of a semi-circular plot and we need to find the area and perimeter of that plot. We can easily find the area and perimeter of this plot by putting the values in the formulas.

As we know that ,

✬ Area of semi-circle = πr²/2

✬ Perimeter of semi-circle = πr

Where,

• π is 22/7
• r is radius

Finding the area :-

⇒ πr²/2

⟶ 22/7 × 21 × 21 × 1/2

⟶ 11 × 3 m  × 21 m

⟶ 693 m²

Finding the perimeter :-

⇒ πr

⟶ 22/7 × 21 m

⟶ 22 × 3 m

⟶ 66 m

Hence,

• Area of the plot is 693m² and perimeter is 66m

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