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Bab Bangun Datar
Matematika SMP Kelas VII

a] lebar = √(sisi miring² - p²)
lebar = √((2√10)² - 6²)
lebar = √(40 - 36)
lebar = 2 cm

b] keliling = 2 x (p + l)
keliling = 2 x (6 + 2)
keliling = 2 x 8
keliling = 16 cm

c] luas = p x l
luas = p x l
luas = 6 x 2
luas = 12 cm²

l = akar 2 akar 10 kuadrat - 6 kuadrat
= akar 40 - 36
= akar 4 = 2
Keliling = 2 X ( 6 + 2 )
= 2 X 8 = 16 cm
Luas = 6 X 2 = 12 cm persegi