Question

Panjang sisi belah ketupat 10 cm salah satu diagonalnya 12 cm Tentukan keliling dan luas belah ketupat

Answer 1

Keliling= 4xsisi=4x10=40cm
luas=1/2.d1.d2=1/2x12x12=72cm^2

Answer 2

Sisi = 10 cm
diagonal 1 = 12 cm → ½ diagonal nya = 6 cm

Diagonal 2 = 2 x √10² - √6²
= 2 x √100 - √36
= 2 x √64
= 2 x 8
= 16 cm

Keliling = 4 x s
= 4 x 10
= 40 cm

Luas = 12 x 16 ÷ 2
= 96 cm²