Jawab:
Panjang AC = = 5 cm
Panjang AB = = 12 cm
a. Keliling ABCD = AB + BC + CD + AD = 12 + 13 + 4 + 3 = 32 cm
b. Luas ACD = 1/2 x alas x tinggi = 1/2 x AD x DC = 1/2 x 3 x 4 = 6 cm²
(alas tegak lurus dengan tinggi segitiga (membentuk siku-siku))
Luas ABD = 1/2 x AB x AC = 1/2 x 12 x 5 = 30 cm².
Luas ABCD = luas ACD + luas ABD = 6 + 30 = 36 cm².
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Jawab:
Panjang AC = = 5 cm
Panjang AB = = 12 cm
a. Keliling ABCD = AB + BC + CD + AD = 12 + 13 + 4 + 3 = 32 cm
b. Luas ACD = 1/2 x alas x tinggi = 1/2 x AD x DC = 1/2 x 3 x 4 = 6 cm²
(alas tegak lurus dengan tinggi segitiga (membentuk siku-siku))
Luas ABD = 1/2 x AB x AC = 1/2 x 12 x 5 = 30 cm².
Luas ABCD = luas ACD + luas ABD = 6 + 30 = 36 cm².