Question

Keliling sebuah belah ketupat 120 cm. jika panjang salah satu diagonalnya48 cm,luas belah ketupat nya brp?

Answer 1

Keliling belah ketupat = 4s
4s = 120
s = 120 / 4
s = 30 cm

s = √(1/2d1)² + (1/2d2)²
s = √24² + x²
30 = √576 + x²
√900 = √576 + x²
900 = 576 + x²
x² = 900 - 576
x² = 324
x = √324
x = 18

d2 = 18 * 2
= 36 cm

Answer 2

S = 120 / 4s = 30 cm s = √(1/2d1)² + (1/2d2)² s = √24² + x² 30 = √576 + x² √900 = √576 + x² 900 = 576 + x² x² = 900 - 576 x² = 324 x = √324 x = 18 d2 = 18 × 2 = 36 cm