Question

Construct the quadrilateral DEAR in which DE = 4 cm , EA = 5 cm ,
AR= 4.5 cm , ∠E = 60° , ∠A = 90°. Write steps of construction

Answer 1

Step-by-step explanation:

Answer :

20(x-18y)

Solution :

a=(x+y) and d= ( x-y) -(x +y) =-2y

S20=202x[2a+(20−1)d]=10×[2(x+y)+190×(−2y)]=20(x−18y)