Quadrilateral abcd is similar to quadrilateral qrst. ab measures 4.2 centimeters, and bc measures 1.8 centimeters. if qr measures 6.3 centimeters in length, what is the perimeter of quadrilateral qrst?

answer: cos [   arcsin (3/5) - arccos (1/2) ] =

step-by-step explanation: × = 3/5 = 0.6--> x = 36.87 and x = 180 - 36.87 = 143.13 deg

cos y = 1/2 --> y = +- 60 deg a. cos (x - y) = cos (143.13 - 60) = cos 83,13  

=

0.12

b. cos (36.87 - 60) = cos (-23.23) = 0.92

ƒ = 0.03b

hope this ( :

step-by-step explanation: