Question

explain how angle rts is 90degree

Answer 1

Answer:

as AB is parallel to CD so Angle BRS + angle RSD = 180 degree......(1)

St & RT is the angle  bisector

So half of the sum (from (1))------(Angle BRS + angle RSD)/2 ----is 90Degree...(2)

in triangle RTS, angle RTS= 180 - (Angle BRS + angle RSD)/2

                                           =180 - 90

                                            = 90 degree

Step-by-step explanation:

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