MR-686 / 6. problem

Calculate the area of a parallelogram whose heights are 3 cm and 2√3 cm, and the angle between them is 60°.

A=a·ha=b·hb

sin 60°=hba=hab

32=23a=3b

a·3=2·2·3

a=4

A=a·ha=4·3

A=12