Question

Can someone tell me what the formula is to solve this question.

If the diagonals of a rhombus are 8 cm and 15 cm long, find the area of the rhombus.

The answer choices are:
a) 60 square cm
b) 240 square cm
c) 120 square cm
d) 480 square cm

I don't want to be given the answer, just the formula. Thank you!

Answer 1

see http://www.mathopenref.com/rhombusarea.html
(method 2)

Answer 2

Thanks :)