A bookmark is like a rectangle with a semicircle attached at both ends. The rectangle is 12 cm long and 4 cm wide. The diameter of each semicircle is the width of the rectangle. What is the area of the bookmark?

Question

1930 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2016-02-15T19:37:01

#(48 + 4pi) cm^2=60.57cm^2#

2 semicircles of equal diameters make one circle
#diameter=4# => #radius=(diameter)/2=2#

#S_circ=pi*r^2=pi*2^2=4pi#

#S_"rectangle"="length"*"width"=12*4=48#

#S_T=S_"rectangle"+S_circ=(48 + 4pi) cm^2=60.57cm^2#