Pentagon one side is 20 find A

The fact that the pentagons are similar means that there is a proportional relationship between corresponding sides. Likely side AB is intended to correspond to side FG, so side HI will correspond to side CD.

(Side of FGHIJ)/(Side of ABCDE) = HI/CD = FG/AB

HI/5 = 30/10 = 3 (put the numbers into the above equation)

HI = 5*3 = 15 (multiply the equation by 5)

Side HI is 15 units long.

(Side of FGHIJ)/(Side of ABCDE) = HI/CD = FG/AB

HI/5 = 30/10 = 3 (put the numbers into the above equation)

HI = 5*3 = 15 (multiply the equation by 5)

Side HI is 15 units long.