Answer:
12 cm
Step-by-step explanation:
Given :-
- A wire shaped to form a square of area
- 81cm².
- An equilateral triangle was formed by
- the same wire.
To Find :-
- The length of a side of the triangle formed?
Solution :-
We know that the area of square is ,
> a² = 81 cm²
> a = √81 cm²
> a = ±9 cm
> a = 9cm ( -ve not possible )
Therefore perimeter ,
> P = 4a
> P = 4 * 9cm
> P = 36 cm .
We know all sides of ∆ are equal. therefore ,
> a + a + a = 36cm
> 3a = 36cm
> a = 36 cm/3
> a = 12cm
