panjang PQRS, panjang PR=(2x+6)cm dan panjang RS=(4x-4) cm. panjang diagonal RS adalah

mencari nilai x
= ( 2x + 6 ) + ( 4x - 4 )
= 2x + 4x + 6 - 4
= 6x + 2
x = 6/2
x = 3 cm
panjang diagonal RS = (4x - 4)
= (4.3 - 4)
= 12 - 4 = 8 cm.
jadi panjang diagonal RS adalah 8 cm.

2x + 6 = 4x - 4
2x - 4x = -4-6
-2x = -10
x = 5

PR
(2x+6)
= 2(5) + 6
= 10+6
= 16

RS
(4x-4)
= 4(5)-4
= 20-4
= 16

h² = a² + t²
= 16² + 16²
= 256 + 256
= 512
h = √512
h = 22,62 cm²