Easy
The sides of △ABC\triangle A B C△ABC are 8 cm,7 cm8 {~cm}, 7 {~cm}8 cm,7 cm and 5 cm5 {~cm}5 cm respectively.Find out its semi-perimeter.
10 cm10 {~cm} 10 cm
20 cm20 {~cm} 20 cm
15 cm15 {~cm} 15 cm
25 cm25 {~cm} 25 cm
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