P is any point inside the rectangle ABCD. If PA = 27 cm, PB = 21 cm, PC = 6 cm, then the length PD (in cm) is equal to:
A15
B10
C12
D18
A15
B10
C12
D18
Related Questions:
Which of the following is true?
a) Every trapezium is a parallelogram.
b) Every parallelogram is a square.
c) Every rectangle is a square.
d)Every square is a rhombus.