tolong jelaskan bagaimana caranya #thx

t = √25^2 - √15^2 = √625 - √225 = √400 = 20
t = d = 20 cm
Kll trapesium = 20 + 35 + 25 + 50 = 130cm
Kll 1/2 lingkaran = 1/2 × 3,14 × 20 = 31,4 cm
Kll yg diarsir = 130 - 31,4 = 98,6 cm