Question

an equilateral triangle with the dimensions 2r,5s-2,r+s+5
​

Answer 1

Step-by-step explanation:

If the side of the equilateral triangle is \( a \), its perimeter P is given by

P = 3 \( a \)

\( a \) = P / 3 = 45 / 3 = 15 cm

Area A = \( a^2\dfrac{\sqrt 3}{4} \) = = \( 15^2\dfrac{\sqrt 3}{4} \) = \( \dfrac{225} {4} {\sqrt 3} \) cm 2