Question

sekeliling belah ketupat 100cm dan pajang salah satu diagonalnya 30cm luas belah ketupat tersebut adalah​

Answer 1

Jawab:
Luas = 600 cm²

Penjelasan:
Diketahui:
Keliling belah ketupat (K) = 100 cm

sisi belah ketupat (m)
m = K/4 = 100/4
--> m = 25 cm
Diagonal a = 30 cm
--> a = 30 cm

Ditanya luas (L)
Cari diagonal b
b = 2×√(m²-(a/2)²)
b = 2×√(25²-(30/2)²)
b = 2×√(25²-15²)
b = 2×√((25-15)×(25+15))
b = 2×√(10×40)
b = 2×√400
b = 2×20
b = 40 cm

Luas (L)
L = (a×b)/2
L = (30×40)/2
L = 30×20
L = 600 cm²
Luas = 600 cm²

( x c v i )