Question

Tolong no 12 ya... Makasih

Answer 1

R = 1/2 x 14
  = 7
luas = ( s x s) + 3(( s x s) - ( 1/4 x π x r²))
        = (7x7) + 3(( 7x 7) - (1/4 x 22/7 x 7 x 7)
        = 49 + 3 ( 49 - (1/2 x 11 x 7)
        = 49 + 3 ( 49 - 38,5)
        = 49 + 3( 10,5)
        = 49 + 31,5
        = 80,5 cm²