Soal no.
22:
s = ½ x (a + b + c)
= ½ x ( 5 + 5 + 6)
= ½ x 16
= 8
Luas segitiga ABC = √(s(s – a)(s – b)(s – c))
=
√(8(8 – 5)(8 – 5)(8 – 6))
= √(8.3.3.2)
= 12 cm2
Jari-jari lingkaran luar (R) = (a x b x c)/(4L)
=
(5 x 5 x 6)/(4 x 12)
=
3,125 cm
Soal no. 38:
Luas alas balok = panjang x lebar
112 = 14 x lebar
lebar = 112 : 14
lebar = 8 cm
Volume balok =
p x l x t
=
14 x 8 x 5
=
560 cm3
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