Question

Meena wants to make a cloth mask by joining two equal size triangular pieces of sides 5cm,8cm and 5cm.how much cloth has she required?

12cm²

10cm²

20cm²

24 cm²​

Answer 1

Answer:

$12cm^{2}$

Step-by-step explanation:

We need to use hero's formula

so the formula is

$\sqrt{s(s-a)(s-b)(s-c)}$

s=  a+b+c/2

=> 5+5+8/2 = 9

$\sqrt{9(9-5)(9-5)(9-8)} \\\sqrt{9*4*4*1}\\\sqrt{3*3*4*4*1*1}$

=> 3*4*1

=>12

Answer 2

Answer:

12cm

2

Step-by-step explanation:

We need to use hero's formula

so the formula is

$\sqrt{s(s-a)(s-b)(s-c)} \\</p><p>=> s(s−a)(s−b)(s−c)\\</p><p> </p><p> </p><p></p><p>s= a+b+c/2\\</p><p></p><p>=> 5+5+8/2 = 9$

$\begin{gathered}\sqrt{9(9-5)(9-5)(9-8)} \\\sqrt{9*4*4*1}\\\sqrt{3*3*4*4*1*1} \\\\end{gathered}$

=> 3*4*1

=>12