Jawab:

Penjelasan dengan langkah-langkah:

g. e = 24 ; f = 18 ; g = 30

s = (e + f + g)/2

s = (24 + 18 + 30)/2

s = 36

Luas = √{s (s - e) (s - f) (s - g)}

= √{36 (36 - 24) (36 - 18) (36 - 30)}

= √{36 (12) (18) (6)}

= √46656

= 216 cm²

h. p = 30 ; q = 16 ; r = 34

s = (p + q + r)/2

s = (30 + 16 + 34)/2

s = 40

Luas = √{s (s - p) (s - q) (s - r)}

= √{40 (40 - 30) (40 - 16) (40 - 34)}

= √{40 (10) (24) (6)}

= √57600

= 240 cm²

i. b = 7 ; c = 15 ; d = 20

s = (b + c + d)/2

s = (7 + 15 + 20)/2

s = 21

Luas = √{s (s - b) (s - c) (s - d)}

= √{21 (21 - 7) (21 - 15) (21 - 20)}

= √{21 (14) (6) (1)}

= √1764

= 42 cm²