100% = 1600
120% = 1920
1920/120 = 1536/y
1920y = <span>184320 (cross multiply)
y = 96%
decrease of 24% from 1920</span>

Since it's a Trapezoid with its non - parallel sides equal to one another,

[ By forming co - interior angle pair ]



Now, similarly,



Similarly,



Answer:
r=4
Step-by-step explanation: