Perbandingan p.rusuk dua kubus 3 : 5. Jmlh l.permukaan kedua kubus adlh 816. Tentukan panjang diagonal bidang, diagonal ruang, dan bidang diagonal pd masing” kubus
816 = (6xs1^2) + ( 6xs2^2)
816 = 6 (s1^2+s2^2)
136 =s1^2 + s2^2
136 = 9x^2 + 25 x^2
136 = 34x^2
x^2 = 4
x = 2
s1 = 3x = 6 cm, s2 = 5x = 10 cm
a. diagonal bidang
s=6 cm, diagonal = a akar 2 = 6 akar 2
s = 10, diagonal = 10 akar 2
b. diagonal ruang
s= 6 cm, diagonalnya 6 akar 3
s = 10 cm, diagonalnya 10 akar 3
c. luas diagonal bidang
s = 6, diagonalnya 36akar2
s = 10, diagonalnya 100 akar2