Question

А B G с a a F D E The diagram shows a British 50 pence coin. The seven arcs AB, BC, ..., FG, GA are of equal length and each arc is formed from the circle of radius a having its centre at the vertex diametri- cally opposite the mid-point of the arc. Show that the area of the face of the coin is a? SI (- 7 tan 6).

Answer 1

ar of sector AOB : ar_Of ABE- 2Laroof DOBE) kah_2[0% tannia) . Aroof coin face ta² at tanana :] Ta- HIN naga tam 14 a(x-7 danaria