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Verified answer
D = 35 cma = 21 cm
t^2 = d^2 - a^2
t^2 = 35^2 - 21^2
t^2 = 1225 - 441
t^2 = 784
t = akar 784
t = 28 cm
L = 1/2 × a × t
L = 1/2 × 21 × 28
L = 294 cm^2
R = (a × d × t) / (4 × L)
R = (21 × 35 × 28) / (4 × 294)
R = 20580/1176
R = 17,5 cm
Jadi panjang jari-jari lingkaran luarnya adalah
17,5 cm