The diagonals of a kite are 21cm and 11cm. Find the perimeter of the kite.

64 cm

Step-by-step explanation:

You get the value of the perimeter by adding up all the four sides of the kite. Kites typically have 4 sides, and 2 equal sides, this means that there are two sides of the kite which are 21 cm long, and 2 sides that are 11 cm long. This represented as an expression would be 21+21+11+11, which would simply equal to 64 cm

D) m and n should be negative

Step-by-step explanation: