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Kelas : 7 SMP
Pembahasan : terlampir
a = 7
t^2 = m^2 - a^2
t^2 = 25^2 - 7^2
t^2 = 625 - 49
t^2 = 576
t = √576
t = 24 cm
L trapesium = 1/2 × (14 + 28) × 24 cm^2
= 42 × 12 cm^2
= 504 cm^2
L lingkaran = 1/2 × 22/7 × 7 × 7 cm^2
= 77 cm^2
L arsir = 504 cm^2 - 77 cm^2
= 427 cm^2