The sides of an equilateral triangle are 8 units long. What is the length of the altitude of the triangle?5 StartRoot 2 EndRoot units4 StartRoot 3 EndRoot units10 StartRoot 2 EndRoot units16 StartRoot 5 EndRoot units

Answer:The perimeter of parallelogram PQRS = 2\sqrt{10}+8\sqrt{2} ⇒ 2nd answerStep-by-step explanation:* Lets revise some properties of the parallelogram- Each two opposite sides are parallel- Each two opposite sides are equal- Its perimeter is the twice the sum of two adjacent sides* Lets solve the problem∵ PQRS is a parallelogram∵ The length of side SR is ∵ The length of side QR is ∵ SR and RQ are two adjacent sides∵ The perimeter of parallelogram PQRS = 2(RQ + SR)∴ The perimeter of parallelogram PQRS = ∵  = ∵  = ∴ The perimeter of parallelogram PQRS =