tentukan keliling dan luas bangun berikut

a.
tinggi = √5²-4² = √25-16 = √9 = 3

Keliling = 2(8+5) = 2(13) = 26 cm
Luas = 8×3 = 24 cm²

b.
sisi yang blm diketahui = √15²-9² = √225-81 = √144 = 12 cm

Keliling = 12+15+9 = 36 cm
Luas ½×9×12 = 54 cm²

c.
sisi miring kanan = √24²+18² = √576+324 = √900 = 30 cm
sisi miring kiri = √24²+7² = √576+49 = √625 = 25 cm

Keliling = 20+25+7+20+18+30 = 120 cm
Luas = ½×(20+45)×24 = 780 cm²