tolong bsk udah di kmplkan ......!

Sisi miring segitiga = √24² + 7² = √576 + 49 = √625 = 25 cm

Keliling Segitiga = 25 + 24 + 7 = 56 cm

Luas Segitiga = 1/2 . a . t = 1/2 . 7 . 24 = 84 cm²

jarjari lingkaran dalam = Luas / 1/2.keliling
                                    = 84 / 1/2.56
                                    = 84 / 28
                                    = 3 cm

Jawaban B

Mapel : Matematika
Kelas : VIII SMP
Bab : Lingkaran

Pembahasan :
Ingat Triple Pythagoras 24 , 7 , 25

S = 1/2 K
S = 1/2(24 + 7 + 25)
S = 1/2(56)
S = 28

Luas = 1/2at
Luas = 1/2(24)(7)
Luas = 84 cm²

Rdalam = L/S
Rdalam = 84/28
Rdalam = 3 cm

Jawaban : B