Question

1.)hitung luas belah ketupat jika
a.)sisinya 20 cm dan salah satu diagonalnya 24cm
b.)kelilingnya 68cm dan salah satu diagonalnya 16cm
c.)kelilingnya 60cm perbandingan diagonalnya 4:1

Answer 1

1/2 d2 = √20²-12² = √400-144 = √256 = 16 cm
d2 = 32 cm
L = 1/2 x 32 x 24 = 384 cm2

K = 68
s = 68 : 4 = 17 cm
1/2 d2 = √17²-8² = √289-64 = √225 = 15 cm
d2 = 30 cm
L = 1/2 x 30 x 16 = 240 cm2

K = 60
s = 60 : 4 = 15 cm
d1 = 4x => 1/2 d1 = 2x
d2 = x => 1/2 d2 = 1/2 x

yg c susah, aku nggk bisa, maaf ya

Answer 2

A. d2 = 400 - 144 = 16
   L = d1 x d2 / 2 = 24 x 32 / 2 = 384 cm2

b. s = k : 4 = 68 :4 = 17
   d2 = = 15
  L = d1 x d2 / 2 = 16 x 30 / 2 240 cm2

c.