Question

the diagonal of rhombus are 5 cm and 8cm . find it's perimeter and area​

Answer 1

Step-by-step explanation:

let two diagonals d1 = 5cm and d2 = 8cm

Area of rhombus....

from the formula

d1² + d2² = 4a²

5² + 8² = 4a²

25 + 64 = 4a²

89 = 4a²

a² = 89/4

a² = 22.25

a = √22.25

a = 4.716

perimeter of rhombus = 4a

= 4 × 4.716

= 18.864

Area of rhombus = 1/2 d1 d2

= 1/2 × 5 × 8

= 20cm