Question

Find the height and area of the equilateral triangle ​

Answer 1

As here we are given with an equilateral triangle, whose side is 3 cm, and we need to find the height and area of the equilateral triangle. So, for this let's recall that, the area of any equilateral triangle with side a is given by ;

• ${\boxed{\bf{Area_{(Equilateral\:\: Triangle)}=\dfrac{\sqrt{3}}{4}a^{2}}}}$

So, if we substitute a = 3, in our Formula, it will yield to

${:\implies \quad \sf Area_{(Equilateral\:\:Triangle)}=\dfrac{\sqrt{3}}{4}(3)^{2}}$

${:\implies \quad \sf Area_{(Equilateral\:\:Triangle)}=\dfrac{\sqrt{3}}{4}(9)}$

${:\implies \quad \boxed{\bf{Area_{(Equilateral\:\:Triangle)}=\dfrac{9\sqrt{3}}{4}\:\:cm^{2}}}}$

Now, as we know that, for any triangle we also have a formula that is ;

• ${\boxed{\bf{Area_{(Triangle)}=\dfrac{1}{2}\times Base\times Height}}}$

Now, Here as the triangle is equilateral, so it's base will just be same 3, and if we let height be H, so we will be having

${:\implies \quad \sf \dfrac{1}{2}\times 3\times H=\dfrac{9\sqrt{3}}{4}}$

${:\implies \quad \sf H=\dfrac{9\sqrt{3}}{4}\times \dfrac23}$

${:\implies \quad \boxed{\bf{Height=\dfrac{3\sqrt{3}}{2}\:\:cm}}}$