Question

Buat sebuah belah ketupat kelilingnya 80 cm panjang salah satu diagonalnya 32 cm Berapakah luasnya?

Answer 1

Keliling = 4 x s
80 = 4 x s
s = 80 : 4 = 20
luas = 1/2 x d1 x d2
= 1/2 x 20 x 20
= 200 cm2
semoga membantu ^^

Answer 2

K = 4s
80 = 4s
s = 80/4 = 20 cm
1/2dia.2 = √s^2 - (1/2dia.1)^2 = √20^2 - (1/2×32)^2 = √400 - 256 = √144 = 12 cm
dia.2 = 2 × 12 = 24 cm
jadi,
L = (d1×d2)/2 = (32×24)/2 = 384 cm2,,