Question

How ti find area of 21m ,28m,35m sides

Answer 1

Since there is 3 sides, give figure is triangle

By using Heron's Formula we can calculate the area.


we know Heron's Formula states

Area =
$\sqrt{s(s - a)(s - b)(s - c)}$
where s = semi perimeter i.e. half of perimeter and a,b and c are sides

Semi perimeter
= (21 + 28 + 35)/2
= 42


Now area =
$\sqrt{42(42 - 21)(42 - 28)(42 - 35)} \\ = \sqrt{42 \times 21 \times 14 \times 7 } \\ = > \sqrt{86436} \\ = > 294$
Hence area of given figure is 294m²

Hope it helps dear friend ☺️✌️